Assiduous vs Diligent: What’s the Difference?

The difference at a glance

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.

What does Assiduous mean?

adjective · /əˈsɪdjuəs/

Showing great care, effort, and attentiveness; consistently applying oneself with dedication and thoroughness.

Assiduous in a sentence

Her assiduous preparation for the exam showed in the quality of her answers.

He was assiduous in keeping records — nothing was lost, nothing overlooked.

What does Diligent mean?

adjective · /ˈdɪlɪdʒənt/

Having or showing consistent care and effort in what you do; thorough and hard-working.

Diligent in a sentence

Her diligent preparation meant she was ready for every question.

He was diligent about checking his work twice before submitting.

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