Assiduous

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.

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.