assiduous
Americanadjective
-
constant in application or effort; working diligently at a task; persevering; industrious; meticulous.
an assiduous student.
- Antonyms:
- lazy, inconstant
-
assiduous reading.
- Synonyms:
- persistent, tireless, continuous
- Antonyms:
- lazy, inconstant
adjective
-
hard-working; persevering
an assiduous researcher
-
undertaken with perseverance and care
assiduous editing
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
Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.
The U.S. assessment attributed the escapes to mismanagement by Syria’s government and a lack of assiduous custody of the camp’s large security perimeter, the U.S. officials said.
Always an assiduous public-image crafter, George Washington paid meticulous attention to both his personal appearance and that of his beloved Mount Vernon estate, where he constantly received friends, associates and admirers.
Norris' success in 2025 was the consequence of a big step in performance in the second half of the season, after assiduous work with his team on improving following a difficult first few races.
From BBC
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
Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023
Idioms from The American Heritage® Idioms Dictionary copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.
