How to use "irrational" in a sentence

Her denial was as resolute as it was irrational

If she was ever to stop dreaming about the boy, if she were to get control of her grief, she must begin her recovery here, in this room, by conquering her irrational need to preserve his possessions in situ.

If he became verbally violent and abusive, if he were irrational, she would need to have a clear head to deal with him

Lunatics and just plain irrational people didn't intentionally try to amuse.

She had the irrational fear that, if she said his name loudly, the spell would be broken and he would vanish forever.