/ ˌkɒnʃiˈenʃəs; NAmE ˌkɑːn-/ adjective
taking care to do things carefully and correctly :
a conscientious student / teacher / worker
► con·scien·tious·ly adverb :
She performed all her duties conscientiously.
► con·scien·tious·ness noun [ U ]
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WORD ORIGIN
early 17th cent.: from French consciencieux , from medieval Latin conscientiosus , from Latin conscientia , from conscient- being privy to, from the verb conscire , from con- with + scire know.