conscientious

focus on scientious part of this word...and relate it to scientist..they are careful while conducting new experiments.

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pronouncing the word 'conscientious' requires lot of care.so conscientious means doing a work carefully.

it simply means "conscious"

Conscientious people work with a devotion supported by their conscience (zameer) which is an internal willl to do good and correct

con - koń (horse). "W Szczebrzeszynie koń brzmi w trzcinie". + imagine koń (horse) as scientist.