Last Update: May 30, 2022

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Conscientious and unremitting diligence.

If you call someone assiduous, it's a compliment. It means they're careful, methodical and very persistent. Good detectives are classically assiduous types. Assiduous comes from two Latin words: assiduus, meaning "busy incessant, continual or constant," and assidere, meaning "to sit down to" something.

Some common synonyms of assiduous are busy, diligent, industrious, and sedulous. While all these words mean "actively engaged or occupied," assiduous stresses careful and unremitting application.