Select the INCORRECTLY spelt word.

Ingenuos

The incorrectly spelled word is "Ingenuos." The correct spelling is "Ingenuous."

Here's an explanation for each option:

1. Perfidy: This is the correctly spelled word. It refers to deceitfulness or betrayal of trust.

2. Misanthrope: This is the correctly spelled word. It refers to a person who dislikes or distrusts humanity and avoids human society.

3. Relentless: This is the correctly spelled word. It means persistent, unyielding, or not giving up easily.

4. Ingenuos: This is the incorrectly spelled word. The correct spelling is "Ingenuous," which means innocent, naïve, or frank in character.