Conscientious
/kˌɑnʃiˈɛnʃəs/
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Definition
(adj) Thorough, careful, or vigilant in one’s task performance; painstaking.
Sentence Examples
I think Tom is conscientious.
Tom is quite conscientious, isn't he?
CEFR Practice Quiz
As a highly ____ employee, she always double-checked her complex reports for any minor errors.