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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.
Here are all the possible meanings and translations of the word irrationality. Princeton's WordNet(0.00 / 0 votes)Rate this definition: Wiktionary(0.00 / 0 votes)Rate this definition: irrationality(Noun) The quality or state of being irrational; want of the faculty or the quality of reason; fatuity.