What is an adjective for fool?

Here are some adjectives for "fool," depending on the specific connotation you're going for:

General foolishness:

* foolish

* silly

* stupid

* naive

* unwise

* imprudent

* gullible

* idiotic

* brainless

More negative connotations:

* absurd

* ridiculous

* ludicrous

* inane

* asinine

* moronic

* imbecilic

* deranged

* crazy

More playful connotations:

* goofy

* whimsical

* daffy

* eccentric

The best choice depends on the context and the specific meaning you want to convey.