What is an antonym for embellish?

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

To simplify or make plain:

* Simplify

* Streamline

* Deprive (of ornamentation)

* Strip (of embellishments)

* Understate

* Minimize

To be honest or truthful:

* Understate

* Downplay

* Be blunt

* Be factual

* Be truthful

To make less appealing or attractive:

* Mar

* Deface

* Spoil

* Tarnish

The best antonym will depend on the specific meaning you want to convey.