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earnest

 
 
/ˈɜːnɪst/ adjective

Definition

very serious and sincere: an earnest young man an earnest effort
in earnest If something begins to happen in earnest, it really starts to happen in a serious way: The research will begin in earnest early next year.
be in earnest to be very serious about something and mean what you are saying
earnestly adverb earnestness noun [U]
(Definition of earnest adjective from the Cambridge Learner's Dictionary © Cambridge University Press)

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