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Noun: shrillness  shril-nus
  1. The quality of being sharp or harsh to the senses
    "the shrillness of her hair colour"
     
  2. A harsh, grating, or unpleasantly high-pitched quality, especially of sound or speech
    "The shrillness of the alarm clock jolted him awake";
    - stridence, stridency

Type of: interest, interestingness, quality, timbre, tone

Encyclopedia: Shrillness