Select the INCORRECTLY spelt word.

The incorrectly spelt word is Irrilegious. The correct spelling is Irreligious.

The other words are spelled correctly.

Here is a breakdown of the spelling of each word:

• Irrelevant is spelled correctly. It means "not having any relevance or bearing on the matter at hand".
• Irritable is spelled correctly. It means "easily annoyed or made angry".
• Irrigate is spelled correctly. It means "to supply water to land for agricultural purposes".