Irrational or illogical; inconsistent with reason or common sense and therefore hard to accept.
その主張は証拠がなく、不合理に思える。
That claim lacks evidence and seems unreasonable.
会社の方針に不合理な点があれば改善を要求するべきだ。
If there are unreasonable aspects to the company's policy, you should demand improvements.
感情だけで決めると不合理な結果になることがある。
Deciding only by emotion can lead to unreasonable outcomes.