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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.
Brevity, conciseness refer to the use of few words in speaking. Brevity emphasizes the short duration of speech: a response reduced to extreme brevity. Conciseness emphasizes compactness of expression: Her prose is clear in spite of great conciseness.