How would I draw something for the word credible?

That’s a really sophisticated word for his age group. It would be hard for anyone to draw a picture about an abstract adjective.

(He’s supposed to draw, right, and not you?) I would question the teacher about the assignment, if I were his dad. He could do two sketches if he were allowed to use synonyms.

Viz; This is real…draw picture of a turkey

This is not real…draw picture of a unicorn.

How about people who are credible (doctors, teachers) and things that are credible (encyclopedias)?

A car with a price tag on it, and a man standing beside it with money in his hand, a boater hat, and a cane. In a red circle with a line through it.

A tree. Solid, sturdy, and stalwart.