Assiduous
adjective /əˈsɪdjuəs/ — Showing great care and perseverance; diligently attentive.
Definition
Showing great care, effort, and attentiveness; consistently applying oneself with dedication and thoroughness.
Beyond the definition
Assiduous is the quality of a certain kind of excellence — not the flashy kind, but the sustained, quiet kind. The assiduous researcher reads everything. The assiduous teacher returns every email. It's attentiveness maintained over time.
Origin & history
From Latin assiduus (continually present, persistent), from assidere (to sit at, to attend) — from ad- (at, to) + sedere (to sit). Literally: always sitting at it. The image is of someone who never leaves their post.
Example sentences
Illustrative sentences for learning, not verified community posts or sourced quotations.
Her assiduous preparation for the exam showed in the quality of her answers.
He was assiduous in keeping records — nothing was lost, nothing overlooked.
Assiduous attention to detail separated her work from that of equally talented peers.
How to use it
This entry uses an adjective. Follow the examples for the nouns it describes and its position in the sentence.
Choose “Assiduous” when the meaning fits your context: Showing great care, effort, and attentiveness; consistently applying oneself with dedication and thoroughness.
Synonyms
diligent, careful, meticulous, thorough, industrious
Antonyms
negligent, careless, lazy, inattentive
Related words
- diligent
- sedulous
- meticulous
- conscientious
Assiduous vs diligent
Diligent means working hard and consistently — steadily applying effort to a task. Assiduous adds the quality of painstaking attentiveness: not just working hard but paying close, sustained attention to every detail, never leaving your post. An assiduous student takes diligent notes and also marks every error, tracks every source, and follows up on every uncertain point. Diligent is the virtue of effort; assiduous is the virtue of unfailing attention.
Compare this word
Word in the Wild
See how this word appears in life, language and stories.
Illustrative sentences and imagined stories for learning — not verified sightings, interviews, or sourced quotations.
Fictional scene
Precise and careful tailor work
A tailor in a quiet atelier stands at a mannequin, using chalk to carefully mark fine wool fabric with focused, calm intention.
The tailor's intense concentration and precise, repeated actions demonstrate assiduousness. The image captures the consistency and thoroughness required for such skilled work, where every single mark is applied with extreme dedication and care.
Image credit: Wordspun · AI-generated conceptual illustration
Questions about this word
What does "Assiduous" mean?
Assiduous is adjective meaning: Showing great care and perseverance; diligently attentive.. Showing great care, effort, and attentiveness; consistently applying oneself with dedication and thoroughness.
Where does the word "Assiduous" come from?
From Latin assiduus (continually present, persistent), from assidere (to sit at, to attend) — from ad- (at, to) + sedere (to sit). Literally: always sitting at it. The image is of someone who never leaves their post.