Unreasoning (adjective)

Not thinking rationally and logically.

Origin:

The word "unreasoning" is formed by the prefix "un-" which means not, and the word "reasoning" which means the act of thinking rationally and logically. together they form an adjective that means not thinking rationally and logically.

Examples:

1. He had an unreasoning fear of heights.
2. She had an unreasoning hatred for spiders.
3. The dog had an unreasoning loyalty to its owner.
4. The baby had an unreasoning fear of strangers.
5. The man had an unreasoning belief that he was right.