Definition of caustic adjective from the Oxford Advanced American Dictionary

     

    caustic

     adjective
    adjective
    NAmE//ˈkɔstɪk//
     
     
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  1. 1critical in a bitter or sarcastic way synonym scathing caustic comments/wit Her speech was a caustic attack on government officials.
  2. 2(of a chemical substance) able to destroy or dissolve other substances synonym corrosive a caustic cleaning product caustic liquid which blisters the skin
caustically
 
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NAmE//ˈkɔstɪkli//
 
adverb “You are no help at all,” she said caustically.
See the Oxford Advanced Learner's Dictionary entry: caustic

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