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Synonyms for unreasonable

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Illogical
irrational, biased, fatuous; see illogical.
Immoderate
exorbitant, extravagant, inordinate; see extreme 2.
Senseless
foolish, silly, thoughtless; see stupid 1, vacant 3. See syn. study at irrational.

See unreasonable in Webster's New World Roget's A-Z Thesaurus II

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