Synonyms of the word

unreasonable

• adj. Not reasonable.

counterintuitive

• adj. Contrary to intuition or common sense.

excessive

• adj. Exceeding the usual bounds of something; extravagant; immoderate.

illogical

• adj. Contrary to logic; lacking sense or sound reasoning.

immoderate

• adj. Not moderate; excessive.

indefensible

• adj. Not defensible; not capable of being defended; vulnerable.
• adj. Incapable of being justified or excused; inexcusable; unpardonable.
• adj. Incapable of being explained; untenable; insupportable; invalid.

inordinate

• adj. Excessive; unreasonable or inappropriate in magnitude; extreme.

irrational

• adj. Not rational; unfounded or nonsensical.
• adj. (mathematics, arithmetic, number theory, not comparable) Of a real number, that cannot be written as the…
• n. A real number that can not be expressed as the quotient of two integers, an irrational number.

mindless

• adj. Showing a lack of forethought or sense.
• adj. Having no sensible meaning or purpose.
• adj. Heedless.
• adj. (of a thing done) Overly repetitive and unchallenging.
• adj. Lacking a mind.

reasonless

• adj. Lacking reason or purpose.

senseless

• adj. Bereft of feeling or consciousness; deprived of sensation; unconscious; insensible.
• adj. Lacking meaning or purpose; without common sense; pointless; meaningless.
• adj. Without consideration, awareness or sound judgement; unreasonable; unwise; stupid.

undue

• adj. Excessive; going beyond that what is natural or sufficient.
• adj. That which ought not to be done; illegal; unjustified.
• adj. (of a payment etc) Not owing or payable.

unjustified

• adj. not justified.

unlogical

• adj. (rare) Not logical; illogical.

untenable

• adj. Not able to be held, as of an opinion or position; unholdable, indefensible.

unwarranted

• adj. Not warranted; being without warrant, authority, or guaranty; unwarrantable.
• adj. Unjustified, inappropriate or undeserved.