assiduous

[ uh-sij-oo-uhs ]

adjective

1. constant in application or effort; working diligently at a task; persevering; industrious; meticulous:

   an assiduous student.

   Synonyms: sedulous, diligent, studious

   Antonyms: lazy, inconstant

2. constant; unremitting:

   assiduous reading.

   Synonyms: persistent, tireless, continuous

   Antonyms: lazy, inconstant

assiduous

/ əˈsɪdjʊəs /

adjective

1. hard-working; persevering

   an assiduous researcher

2. undertaken with perseverance and care

   assiduous editing

Derived Forms

• asˈsiduousness, noun
• asˈsiduously, adverb

Other Words From

• as·sid·u·ous·ly adverb
• as·sid·u·ous·ness noun
• un·as·sid·u·ous adjective
• un·as·sid·u·ous·ness noun

Word History and Origins

Origin of assiduous¹

First recorded in 1530–40; from Latin assiduus, equivalent to assid(ēre) “to sit near or beside, dwell close to” ( assess ) + -uus adjective suffix; -ous

Word History and Origins

Origin of assiduous¹

C16: from Latin assiduus sitting down to (something), from assidēre to sit beside, from sedēre to sit

Example Sentences

There has been assiduous woo-ing of the political establishment too.

From The Daily Beast

Webb was never wild about some of the nitty-gritty aspects of elected office and was not a very assiduous fundraiser.

From The Daily Beast

As an intern at The Nation in 1989, he was an amiable and assiduous fact-checker of my copy.

From The Daily Beast

But despite her allure, her assiduous assault on New York produced no results.

From The Daily Beast

His assiduous reporting and his smart, passionate commentary have impressed colleagues and readers alike.

From The Daily Beast

She soon gave birth to a daughter, her only child, whom she nurtured with the most assiduous care.

From Project Gutenberg

He was not seen again, at least in the flesh, but he became one of the most assiduous frequenters of De Quincey's visions.

From Project Gutenberg

Nobody is a greater slave than an assiduous courtier, unless it be a courtier who is more assiduous.

From Project Gutenberg

Only by an assiduous devotion to the contents of the daily newspapers in their reports of the doings of the socially elect.

From Project Gutenberg

She had been an assiduous student of the eighteenth century philosophers, and on the whole was a lady of considerable culture.

From Project Gutenberg

Related Words

• diligent
• exacting
• indefatigable
• laborious
• scrupulous
• zealous