conscientious.
Thorough, careful, or vigilant in one’s task performance; painstaking.
Meaning & usage
Thorough, careful, or vigilant in one’s task performance; painstaking.
He was a thoughtful and conscientious worker.
Influenced by conscience; principled; governed by a strict regard to the dictates of conscience, or by the known or supposed rules of right and wrong (said of a person).
The advice of wise and conscientious people.
Where this word comes from
From Middle French conscientieux, from Medieval Latin cōnscientiōsus. Its English equivalent could possibly be analyzed as conscient + -ous. See more at conscience.
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Definitions, grammatical labels, IPA, etymology and examples: Wiktionary contributors, extracted by Kaikki / Wiktextract. Adapted under CC BY-SA 4.0. Selected fields and authored examples are shown; third-party quotations and audio are omitted. See contributor history.
Last enriched 2026-09-10. Definitions are in English. Romanizations are shown when supplied by the source; syllable estimates are omitted for unsupported scripts.