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English definition of “flat”

flat

adjective (NOT ACTIVE)    /flæt/ (flatter, flattest)
not interesting, or without emotion or excitement: After the excitement of the party, life seems rather flat now. I thought her performance a little flat. I think the colours in this painting are rather flat (= not varied or bright).Tedious and uninspiring
(Definition of flat adjective (NOT ACTIVE) from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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