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shrillness(noun) the quality of being sharp or harsh to the senses. the shrillness of her hair color. shrillness, stridence, stridency(noun) having the timbre of a loud high-pitched sound.
Define shrill: scream; to utter or emit an acute piercing sound â shrill in a sentence scream; to utter or emit an acute piercing soundâ¦ See the full definition