What is another word for unreasonable?

Need synonyms for unreasonable? Here's a list of similar words from our thesaurus that you can use instead.

Adjective
Lacking sense or sound reasoning
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Adjective
Not guided by or based on good sense
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“He felt that the young men were being unreasonable and threatening.”
Adjective
Not supported or proven by evidence
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Adjective
Unfair and excessive
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Unreasonable increases in the price of petrol.”
Adjective
Pertaining to sophists
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Adjective
Not compliant
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Adjective
Unable to be achieved or realized
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Adjective
Requiring more effort than could be reasonably expected or asked for
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Adjective
Shockingly bad or excessive
Adjective
Of a punch, landing illegally, below the opponent's waist
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Adjective
That cannot be conceived
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Adjective
Compulsively motivated
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Adjective
Not admissible, especially that cannot be admitted as evidence at a trial
Adjective
Behaving irrationally due to anxiety or mental illness
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Adjective
Exercising power in a cruel or arbitrary way
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Adjective
Done to excess; exaggerated
Adjective
Deeply angered but not outwardly displaying it
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Adjective
Not up to the required standard or quality
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Adjective
Having or proceeding from an extreme or fanatical support of or belief in something
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Adjective
Sumptuously rich, elaborate, or luxurious
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Adjective
Contrary to the accepted or expected standard or practice
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Adjective
Using or expending without restraint
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Adjective
Opposing political or social progress or reform