Cambridge Advanced Learner's Dictionary
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Definition
diligent adjective
/ˈdɪl.ɪ.dʒənt/ adj
•
approving careful and using a lot of effort
a diligent student
Leo is very diligent in/about his work.
Their lawyer was extremely diligent in preparing their case.
•
done in a careful and detailed way
The discovery was made after years of diligent research.
diligence
noun
/ˈdɪl.ɪ.dʒənt s/ n [U]
She hoped that her diligence would be noticed at work.
diligently
adverb
/ˈdɪl.ɪ.dʒənt.li/ adv
(Definition of diligent adjective from the Cambridge Advanced Learner's Dictionary)
