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conscientious (adj) very careful in doing things properly; principled.
When you take a lot of care and pains to do something correctly you are conscientious. A conscientious worker is dutiful, that is, they sincerely feel it is their duty to do anything carefully and properly. A conscientious teacher is a sincere teacher who takes their profession seriously. A conscientious student is painstakingly sincere and is deeply interested in learning.
- Being a conscientious worker, Jennifer always pays attention to her work, and strains herself a lot to do properly whatever job is entrusted to her.
- A conscientious teacher, Mrs. Searle is very painstaking and is not satisfied until she is sure that everyone of her pupils has learnt what she has taught.