How can you use the word unreasonable in a sentence?

When you are describing something as not reasonable, you can say, "This man is unreasonable" meaning you can not deal or reason with.

Unreasonable is an adjective that means irrational, unconscionable, extravagant, senseless, or unreasonable. Example sentence:

My boss was unreasonable to expect me to complete the research and hand in a report by tomorrow.