For purposes of illustration: suppose you're having a discussion, say, about English grammar, and the other person says:
..."I know you've brought many proofs for your opinion, and I know that my way can lead to ambiguities in writing. Still, though, I insist that you are wrong." - then he's being unreasonable.
..."Argle-bargle-fargle!" - then he's being senseless.
..."Look! Ponies!" - then what he's saying is irrelevant.
Answer from Alex on Stack Exchangemeaning - "Senseless" and "irrelevant" synonyms of "unreasonable" - English Language & Usage Stack Exchange
When a person is said to be irrelevant | WordReference Forums
Why am I so irrelevant to everyone?
Whether or Not a Fetus is an Individual is Irrelevant to the Topic of Abortion
For purposes of illustration: suppose you're having a discussion, say, about English grammar, and the other person says:
..."I know you've brought many proofs for your opinion, and I know that my way can lead to ambiguities in writing. Still, though, I insist that you are wrong." - then he's being unreasonable.
..."Argle-bargle-fargle!" - then he's being senseless.
..."Look! Ponies!" - then what he's saying is irrelevant.
Those words are not synonyms.
Unreasonable means:
- not guided by or based on good sense
- beyond the limits of acceptability or fairness
Senseless means:
- (referred to a person) unconscious
- without discernible meaning or purpose
Irrelevant means "not connected with or relevant to something".
Your requests are unreasonable.
She has been left senseless, in the middle of the street.
What you are saying is irrelevant; the incident would have happened even if you would have been arrived 10 minutes before.
[Reference: the New Oxford American Dictionary.]