American English

Definition of flatly adverb from the Oxford Advanced American Dictionary



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  1. 1in a way that is very definite and will not be changed synonym absolutely to flatly deny/reject/oppose something Iflatly refused to spend any more time helping him.
  2. 2in a dull way with very little interest or emotion “Oh, it's you,” she said flatly.
See the Oxford Advanced Learner's Dictionary entry: flatly