Irrational ( adjective , noun )

(As an adjective)

Irrational ( adjective )

1. Not based on or in accordance with reason or logic.
2. Not guided by practical considerations.
3. Not having or showing reason or good judgment.

Origin:

From latin irrationalis, from in- ("not") + ratio ("reason, calculation"), ultimately from ratiōnālis ("of reason, rational"). first recorded in english in the 1630s.

Examples:

1. It was irrational for him to quit his job without a backup plan.
2. Her fear of snakes is irrational and prevents her from going on hikes.
3. He made an irrational decision to invest all his savings in one stock.
4. She had an irrational hatred towards all politicians.
5. The idea of spending $100 on a single meal is irrational to most people.

(As a noun)

Irrational ( noun )

1. Not based on or in accordance with reason or logic.
2. Not guided by practical considerations.
3. Not having or showing reason or good judgment.

Origin:

From latin irrationalis, from in- ("not") + ratio ("reason, calculation"), ultimately from ratiōnālis ("of reason, rational"). first recorded in english in the 1630s.

Examples:

1. It was irrational for him to quit his job without a backup plan.
2. Her fear of snakes is irrational and prevents her from going on hikes.
3. He made an irrational decision to invest all his savings in one stock.
4. She had an irrational hatred towards all politicians.
5. The idea of spending $100 on a single meal is irrational to most people.