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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.
shortness of time or duration; briefness: the brevity of human life. the quality of expressing much in few words; terseness: Ironically, it is long-winded Polonius in Shakespeare's Hamlet who famously says that brevity is the soul of wit.