assiduous

adjective

ə-ˈsij-wəs How to pronounce assiduous (audio)
Definition of assiduousnext
as in diligent
involved in often constant activity the fascinating sight of assiduous ants carrying food into the anthill

Synonyms & Similar Words

Relevance

Antonyms & Near Antonyms

Synonym Chooser

How is the word assiduous different from other adjectives like it?

Some common synonyms of assiduous are busy, diligent, industrious, and sedulous. While all these words mean "actively engaged or occupied," assiduous stresses careful and unremitting application.

assiduous practice

When is it sensible to use busy instead of assiduous?

Although the words busy and assiduous have much in common, busy chiefly stresses activity as opposed to idleness or leisure.

too busy to spend time with the children

When could diligent be used to replace assiduous?

The words diligent and assiduous are synonyms, but do differ in nuance. Specifically, diligent suggests earnest application to some specific object or pursuit.

very diligent in her pursuit of a degree

When would industrious be a good substitute for assiduous?

While in some cases nearly identical to assiduous, industrious implies characteristic or habitual devotion to work.

industrious employees

When can sedulous be used instead of assiduous?

The meanings of sedulous and assiduous largely overlap; however, sedulous implies painstaking and persevering application.

a sedulous investigation of the murder

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 assiduous All of it together can swamp even those who are most assiduous about their health. — CBS News, 3 Jan. 2026 The timely message is told in a frequently absurd yet affecting style, including through the assiduous mo-cap of its A-list cast (which includes Léa Seydoux, Elle Fanning, and George Miller). — Lewis Gordon, Vulture, 3 Dec. 2025 The body, which was created in 1829, has been assiduous in ensuring its members receive fair payment for their work in the digital age. — Melanie Goodfellow, Deadline, 14 Nov. 2025 Amid this totalizing assault, the nutria’s assiduous gnawing may seem a relatively mild insult; in the state’s coastal-threat index, the nutria would come in sixth place. — Nathaniel Rich, Harpers Magazine, 20 Aug. 2025 See All Example Sentences for assiduous
Recent Examples of Synonyms for assiduous
  1. diligent
  2. engaged
  3. busy
Adjective
  • More recently, diligent and passionate biologists, chemists, and experts from other disciplines have used technology for contemporary experiments that reveal a spectrum of plant consciousness.
    — Literary Hub, Literary Hub, 20 Aug. 2026
  • Dark circles happen, acne pops up, and dark spots can even appear despite diligent sunscreen use.
    — Christa Joanna Lee, Allure, 14 Aug. 2026
Definition of diligent
Adjective
  • But writing notes by hand requires a more engaged mental filter.
    — Rustin Dodd, New York Times, 3 Sep. 2026
  • By creating measurable value today, employees become more engaged in their roles.
    — Expert Panel®, Forbes.com, 1 Sep. 2026
Definition of engaged
Adjective
  • Then, the Iran war started, resulting in massive disruption to the Strait of Hormuz, once one of the world's busiest oil-shipping lanes.
    — Anniek Bao, CNBC, 3 Sep. 2026
  • Palacios brings plenty to Ipswich with and without the ball, the statement signing in a busy window who could go a long way to keeping them up.
    — Thom Harris, New York Times, 3 Sep. 2026
Definition of busy

Browse Nearby Words

assiduity
assiduous
assiduously
See all Nearby Words

Podcast

Cite this Entry

“Assiduous.” Merriam-Webster.com Thesaurus, Merriam-Webster, https://www.merriam-webster.com/thesaurus/assiduous. Accessed 4 Sep. 2026.

Copy Citation
Last Updated: - Updated example sentences
Love words? Need even more definitions?

Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free!

More from Merriam-Webster

Word of the Day

Listen to the pronunciation of apiary

See Definitions and Examples »

Popular in Grammar & Usage

See More

A Who’s Who Regarding ‘Who’s’ and ‘Whose’

A List of Most Commonly Confused Words

Why do we use apostrophes to show possession?

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

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

Popular in Wordplay

See More

The Longest Long Words List

Stay Woke

Ye Olde Nincompoop: Old-Fashioned Words for 'Stupid'

14 Phobias You Probably Haven't Heard Of

The Words of the Week - Sept. 4
See More

Popular

See More

A Who’s Who Regarding ‘Who’s’ and ‘Whose’

The Longest Long Words List

Stay Woke
See More

Games & Quizzes

See All
Play Quordle: Guess all four words in a limited number of tries. Each of your guesses must be a real 5-letter word.
Quordle Can you solve 4 words at once?
Play Blossom: Solve today's spelling word game by finding as many words as you can using just 7 letters. Longer words score more points.
Blossom Pick the best words!
Play Missing Letter: a crossword with a twist. Each of the 25 puzzle words start with a different letter of the alphabet. Which letter is missing?
The Missing Letter A daily crossword with a twist
anagrams on a chalk board
Word Builder Quiz Vol. 2 Pick the letter that when added to a word will ma...
See All