Definition of piercing adjective from the Oxford Advanced American Dictionary

     

    piercing

     adjective
    adjective
    NAmE//ˈpɪrsɪŋ//
     
     
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  1. 1[usually before noun] (of eyes or the way they look at someone) seeming to notice things about another person that would not normally be noticed, especially in a way that makes that person feel anxious or embarrassed She looked at me with piercing blue eyes. a piercing look
  2. 2[usually before noun] (of sounds) very high, loud, and unpleasant synonym shrill a piercing shriek She has such a piercing voice.
  3. 3[only before noun] (of feelings) affecting you very strongly, especially in a way that causes you pain piercing sadness
  4. 4(of the wind or cold) very strong and feeling as if it can pass through your clothes and skin
  5. 5[only before noun] sharp and able to make a hole in something The animal is covered in long piercing spines.
  6.  
    adverb His eyes were piercingly blue. The weather remained piercingly cold.
See the Oxford Advanced Learner's Dictionary entry: piercing