simpleton

The veriest simpleton knows that.

He's often taken advantage of because he's a simpleton.

Don't be fooled by his simpleton appearance, he's actually quite clever.

The simpleton believed everything he was told without question.

She's not a simpleton, she just prefers to keep things uncomplicated.

The simpleton's innocence was endearing to everyone around him.

He's often mocked for being a simpleton, but he doesn't let it bother him.

The simpleton's lack of understanding led to many misunderstandings.

She's a bit of a simpleton when it comes to technology.

He's too much of a simpleton to understand the complexities of the situation.

The simpleton's straightforward approach made him easy to work with.