Definition of flatly adverb from the Oxford Advanced Learner's Dictionary

     

    flatly

     adverb
    adverb
    BrE BrE//ˈflætli//
     
    ; NAmE NAmE//ˈflætli//
     
     
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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 I flatly 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 American Dictionary entry: flatly