The meaning of UNREASONABLE is not governed by or acting according to reason. How to use unreasonable in a sentence.

UNREASONABLE definition: not reasonable or rational; acting at variance with or contrary to reason; not guided by reason or sound judgment; irrational. See examples of unreasonable …

I find your attitude completely unreasonable. She divorced him on the grounds of unreasonable behavior. If he expects you to do that, I think he's being completely unreasonable. I hope he …

Definition of unreasonable adjective from the Oxford Advanced Learner's Dictionary. not fair; expecting too much. The job was beginning to make unreasonable demands on his free time. …

1. not reasonable or rational; not guided by reason or sound judgment; irrational. 2. not in accordance with practical realities, as attitude or behavior; inappropriate. 3. excessive, …

Jul 24, 2025 · Unreasonable means not guided by or based on good judgment, fairness, or logic. It refers to something excessive, irrational, or not supported by valid reasons. For example, an …

If you say that someone is being unreasonable, you mean that they are behaving in a way that is not fair or sensible.

When someone's unreasonable, they're not using reason, or common sense, to make decisions or demands. Add the prefix un- to reasonable, "having sound judgment," and you get an …

unreasonable meaning, definition, what is unreasonable: not fair or sensible: Learn more.

un•rea•son•a•ble /ʌnˈrizənəbəl, -ˈriznə-/ adj. not reasonable or rational; not guided by or showing reason or good judgment; irrational. too great; excessive, immoderate, or exorbitant: an …