Select the INCORRECTLY spelt word.

Irational

The incorrectly spelled word is Irational. The correct spelling is Irrational.

Here is a breakdown of the spelling of each word:

• Escalation is spelled correctly. It means the process of increasing in size, level, or intensity.
• Irritable is spelled correctly. It means easily annoyed or upset.
• Appreciation is spelled correctly. It means the act of valuing or understanding something.
• Irrational is spelled incorrectly. It means not based on reason or understanding.