What is another word for foolish and silly?

Here are some words that mean foolish and silly, depending on the specific nuance you want to convey:

General:

* Inane

* Frivolous

* Ludicrous

* Absurd

* Preposterous

* Ridiculous

* Naive

* Simple

* Unwise

* Stupid

More playful:

* Goofy

* Whimsical

* Daft

* Ditsy

* Silly

* Clownish

More negative:

* Moronic

* Imbecile

* Idiotic

* Foolish

More formal:

* Fatuous

* Inimical

* Indiscreet

* Imprudent

* Unreasonable

* Irrational

* Unintelligent

The best word to use will depend on the specific context.