Words / C2

uh-SID-yoo-uh-s/əˈsɪdjuəs/

Assiduous means working with care and persistence over time, not a single burst of effort. Choose it instead of hard-working when the point is patient attention (assiduous research, an assiduous host). In speech diligent or thorough is less stiff.

Meaning

Working with great care and attention over time.

Examples

• “Assiduous revision improved her score.”
• “Assiduous fact-checking saved the article.”
• “He was an assiduous visitor to the archive.”

Good to know

Careful persistence. Everyday: diligent.

Near in meaning

diligent

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