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

As the investigation spread across the globe, Ms Kierans said prosecutors realised McCartney had been "very assiduous about saving the images".

From BBC

"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

For assiduous followers of this contest, the arguments from Jenrick, Badenoch and Tugendhat will have felt familiar.

From BBC

Grindset impresario and assiduous podcast guest Scott Galloway loitered by the back bar.

From Slate

“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