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

 

frostily

 adverb
adverb
BrE BrE//ˈfrɒstɪli//
 
; NAmE NAmE//ˈfrɔːstɪli//
 
 
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in an unfriendly way, that suggests that somebody does not approve of something ‘No, thank you,’ she said frostily.