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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.
If you describe a demand, protest, or statement as shrill, you disapprove of it and do not like the strong, forceful way it is said. Shrill voices on both sides of the Atlantic are advocating protectionism. If a bell or whistle shrills, it makes a loud, high-pitched sound. The phone shrilled, making her jump.