unreasonable

Synonyms:

excessive, inordinate, undue

immoderate

beyond reasonable limits

Synonyms

illogical, unlogical

lacking in correct logical relation

immoderate

beyond reasonable limits

irrational

not consistent with or using reason

counterintuitive

contrary to what common sense would suggest

indefensible, untenable

(of theories etc) incapable of being defended or justified

mindless, reasonless, senseless

not marked by the use of reason

undue, unjustified, unwarranted

lacking justification or authorization

Antonyms:

reasonable, sensible

showing reason or sound judgment

fair, just

free from favoritism or self-interest or bias or deception; conforming with established standards or rules

logical

capable of or reflecting the capability for correct and valid reasoning

rational

consistent with or based on or using reason

commonsense, commonsensible, commonsensical

exhibiting native good judgment

healthy, intelligent, level-headed, levelheaded, sound

exercising or showing good judgment

tenable, well-founded

based on sound reasoning or evidence

valid

well grounded in logic or truth or having legal force

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