What is an antonym for cheery?

Here are some antonyms for "cheery," depending on the specific meaning you want to convey:

General negativity:

* Gloomy

* Dour

* Sullen

* Morose

* Depressed

* Dispirited

Lack of enthusiasm:

* Dismal

* Unhappy

* Sad

* Melancholy

* Downcast

Specifically related to the tone of voice or expression:

* Grumpy

* Sour

* Peevish

* Cross

The best antonym for "cheery" will depend on the context of the sentence.