assiduous

American  

[uh-sij-oo-uhs] / əˈsɪdʒ u əs /

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

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assiduous British  

/ əˈsɪdjʊəs /

adjective

1. hard-working; persevering

   an assiduous researcher

2. undertaken with perseverance and care

   assiduous editing

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Other Word Forms

• assiduously adverb
• assiduousness noun
• unassiduous adjective
• unassiduousness noun

Etymology

Origin of assiduous

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

Example Sentences

Powell’s assiduous outreach to his colleagues gives him a good overview of where the proverbial bodies are buried, giving colleagues ample time to voice their objections.

From Barron's

His team-mate Oscar Piastri had progressed significantly through some assiduous work with the team over the winter, and Norris was not feeling the car in the way he needed to be quick.

From BBC

A top-notch campus alone does not produce academic achievement — and, conversely, a brilliant teacher and an assiduous student in a one-room schoolhouse can make for an upstanding education.

From Los Angeles Times

"Martyn is the most professional, assiduous, diligent police officer you will come across and he should never have been put in this position," he said.

From BBC

“I just feel like that assiduous pursuit of some level of truth sets her apart from a lot of people.”

From Los Angeles Times

Related Words

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