WEAK Synonyms: 289 Similar and Opposite Words

Q: How does the adjective 'weak' contrast with its synonyms?

Some common synonyms of weak are decrepit , feeble , fragile , frail , and infirm . While all these words mean "not strong enough to endure strain, pressure, or strenuous effort," weak applies to deficiency or inferiority in strength or power of any sort. // felt weak after the surgery

Q: When is it sensible to use 'decrepit' instead of 'weak'?

The synonyms decrepit and weak are sometimes interchangeable, but decrepit implies being worn-out or broken-down from long use or old age. // the dowager's decrepit retainers

Q: In what contexts can 'feeble' take the place of 'weak'?

Although the words feeble and weak have much in common, feeble suggests extreme weakness inviting pity or contempt. // a feeble attempt to walk

Q: When might 'fragile' be a better fit than 'weak'?

While in some cases nearly identical to weak , fragile suggests frailty and brittleness unable to resist rough usage. // a reclusive poet too fragile for the rigors of this world

Q: When is 'frail' a more appropriate choice than 'weak'?

The meanings of frail and weak largely overlap; however, frail implies delicacy and slightness of constitution or structure. // a frail teenager unable to enjoy sports

Q: Where would 'infirm' be a reasonable alternative to 'weak'?

The words infirm and weak are synonyms, but do differ in nuance. Specifically, infirm suggests instability, unsoundness, and insecurity due to old age or crippling illness. // infirm residents requiring constant care

weak

adjective

ˈwēk

Definition of weak

as in weakened

lacking bodily strength the little boy was simply too weak to lift the box

Synonyms & Similar Words

Relevance

Antonyms & Near Antonyms

as in soft

lacking strength of will or character I was too weak to resist the free doughnuts in the office break room

Synonyms & Similar Words

Antonyms & Near Antonyms

as in thin

not containing very much of some important element the coffee came out too weak because I didn't use enough ground beans

Synonyms & Similar Words

Antonyms & Near Antonyms

as in unreasonable

not using or following good reasoning your argument is weak

Synonyms & Similar Words

Antonyms & Near Antonyms

as in helpless

unable to act or achieve one's purpose the vice president is a relatively weak official

Synonyms & Similar Words

Antonyms & Near Antonyms

Synonym Chooser

How does the adjective weak contrast with its synonyms?

Some common synonyms of weak are decrepit, feeble, fragile, frail, and infirm. While all these words mean "not strong enough to endure strain, pressure, or strenuous effort," weak applies to deficiency or inferiority in strength or power of any sort.

felt weak after the surgery

When is it sensible to use decrepit instead of weak?

The synonyms decrepit and weak are sometimes interchangeable, but decrepit implies being worn-out or broken-down from long use or old age.

the dowager's decrepit retainers

In what contexts can feeble take the place of weak?

Although the words feeble and weak have much in common, feeble suggests extreme weakness inviting pity or contempt.

a feeble attempt to walk

When might fragile be a better fit than weak?

While in some cases nearly identical to weak, fragile suggests frailty and brittleness unable to resist rough usage.

a reclusive poet too fragile for the rigors of this world

When is frail a more appropriate choice than weak?

The meanings of frail and weak largely overlap; however, frail implies delicacy and slightness of constitution or structure.

a frail teenager unable to enjoy sports

Where would infirm be a reasonable alternative to weak?

The words infirm and weak are synonyms, but do differ in nuance. Specifically, infirm suggests instability, unsoundness, and insecurity due to old age or crippling illness.

infirm residents requiring constant care

Example Sentences

Examples are automatically compiled from online sources to show current usage. Read More Opinions expressed in the examples do not represent those of Merriam-Webster or its editors. Send us feedback.

Recent Examples of weak When a tropical depression reaches 39 mph (63 kph) but is weaker than 74 mph (119 kph) they are called tropical storm and receive a name from a pre-established list. — ABC News, 9 Oct. 2026 If anything, Trump’s escalating attempts to strong-arm people into a supposedly nicer term for AI makes him — and the industry itself — look awfully weak. — Adi Robertson, The Verge, 9 Oct. 2026 Shares fell almost 2% after the airline reported weaker-than-expected third-quarter earnings . — Scott Schnipper, CNBC, 9 Oct. 2026 This won't be as powerful as the top-end model thanks to a weaker MediaTek 8189 processor. — James Peckham, PC Magazine, 8 Oct. 2026 See All Example Sentences for weak

Recent Examples of Synonyms for weak

Adjective

Special protection Vaccination is especially important for those 65 years and older, young children, pregnant people, people with chronic medical conditions and those with weakened immune systems.

— Annette Regan, The Conversation, 6 Oct. 2026
Leadership turmoil and a weakened state, as seen with the enfeebled late Ming, could well fuse with latent social tensions to produce an existential crisis.

— Carl Minzner, Foreign Affairs, 5 Oct. 2026

Definition of weakened

Adjective

But, for me, the softer spotlight on HABIBTI has been part of its charm all along — and highlights the risk in releasing three albums at once.

— Carl Lamarre, Billboard, 14 Oct. 2026
Against his soft, sensitive frame, this underwater world looks impossibly hard.

— Alison Foreman, IndieWire, 14 Oct. 2026

Definition of soft

Adjective

Bajaria may also have hit thin ice with Sarandos after the streamer won just 16 Primetime Emmy Awards this year — its worst showing since 2016 and down from 30 in 2025.

— Matt Donnelly, Variety, 16 Oct. 2026
It was designed with a column, sheath silhouette, with sequins, thin spaghetti straps and a midlength skirt.

— Karla Rodriguez, Footwear News, 15 Oct. 2026

Definition of thin

Adjective

But Michael Edney, who worked at the OLC under Bush, said the opinion’s reading of executive privilege was not unreasonable, given the importance that some presidents place on outside consultation.

— Perry Stein, Washington Post, 18 Oct. 2026
Both sides have accused each other of being unreasonable and of ignoring practical concerns about voting and election security, though in very different ways.

— Kevin Rector, Los Angeles Times, 17 Oct. 2026

Definition of unreasonable

Adjective

The moment when the couple’s infant child is taken from them by the authorities is devastating, each of them capturing a sense of helpless isolation from themselves, their community and each other.

— Mark Olsen, Los Angeles Times, 9 Oct. 2026
But the funding cuts mean more and more families like Zarmina's are left helpless.

— ABC News, ABC News, 4 Oct. 2026

Definition of helpless

Adjective

Then, Washington tight end Decker DeGraaf caught a pass and took off down the sideline, the former Glendora High standout running through two feeble-arm tackles on the way to an inexplicable 42-yard touchdown.

— Los Angeles Times, Los Angeles Times, 4 Oct. 2026
Briogeo Destined for Density Serum The Briogeo Destined for Density Serum is a lightweight liquid formula that thickens feeble strands, plumps roots, and rapidly spurs new hair growth.

— Sophie Wirt, InStyle, 17 Sep. 2026

Definition of feeble

Adjective

At a concert this past weekend in Cincinnati, the Beach Boys’ first show since July, apart from a private performance in Dana Point, California, Love appeared somewhat frail, according to a fan video.

— Hilary Lewis, HollywoodReporter, 14 Oct. 2026
The curtain then opened to reveal a frail Mike Love seated in a chair at the center of the stage.

— Andy Greene, Rolling Stone, 12 Oct. 2026

Definition of frail

Adjective

Finally, the third recruits seaweed to gather minerals that are otherwise too dilute to chase.

— New Atlas, New Atlas, 27 July 2026
Clean and disinfect your pruning shears between working on each plant by dipping them into a dilute 10% solution of chlorine bleach water or rubbing alcohol.

— Mary Marlowe Leverette, Southern Living, 4 July 2026

Definition of dilute

Browse Nearby Words

waywardness

weak

weaken

See all Nearby Words

Cite this Entry

Style

“Weak.” Merriam-Webster.com Thesaurus, Merriam-Webster, https://www.merriam-webster.com/thesaurus/weak. Accessed 20 Oct. 2026.

Copy Citation

Synonyms of weak

adjective

Synonym Chooser

Example Sentences

Browse Nearby Words

Cite this Entry

More from Merriam-Webster

Word of the Day

compunction

Popular in Grammar & Usage

'Affect' vs. 'Effect'

Merriam-Webster’s Great Big List of Words You Love to Hate

The Exceptions of '-s' and '-es' Plurals

Is it 'nerve-racking' or 'nerve-wracking'?

What's the difference between 'fascism' and 'socialism'?

Popular in Wordplay

16 Food Words Recently Added to the Dictionary

The Real Origin of 'Supercalifragilistic'

9 Words That Sound Like Insults But Aren't

7 Words for Bad Endings and Rough Situations

Did 'orange' the fruit or the color come first?

Popular

'Affect' vs. 'Effect'

16 Food Words Recently Added to the Dictionary

The Real Origin of 'Supercalifragilistic'

Games & Quizzes