What is a antonym for colorful?

Here are some antonyms for "colorful," depending on the context:

General:

* Dull

* Bland

* Monotone

* Uninteresting

* Pale

* Lackluster

* Desaturated

Specific to visual appearance:

* Black and white

* Gray

* Monochromatic

* Simple

Specific to personality or language:

* Boring

* Plain

* Uninspired

* Unoriginal

* Unremarkable

The best antonym for "colorful" will depend on the specific context in which the word is used.