Definition of decidedly adverb from the Oxford Advanced American Dictionary

     

    decidedly

     adverb
    adverb
    NAmE//dɪˈsaɪdədli//
     
     
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  1. 1(used with an adjective or adverb) definitely and in an obvious way Amy was looking decidedly worried. Their relationship is beginning to look decidedly shaky.
  2. 2 in a way that shows that you are sure and determined about something “I won't go,” she said decidedly.
See the Oxford Advanced Learner's Dictionary entry: decidedly