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English definition of “conscientious”

conscientious

adjective     /ˌkɒn.ʃiˈen.ʃəs/ US  /ˌkɑːn-/
C1 putting a lot of effort into your work: a conscientious studentEffort and expending energyTrying and making an effort conscientiously     /-li/ adverb Effort and expending energyTrying and making an effort conscientiousness     /-nəs/ noun [U] Effort and expending energyTrying and making an effort
(Definition of conscientious adjective from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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