Definitions

1. noun

a substance that can cause feelings of sadness or depression, or a substance that can lower blood pressure

“She took medication that was a depressant and made her feel drowsy.”

2. adjective

causing depression or a lowering of mood, or tending to cause feelings of sadness or despair

“The depressing news made her a depressant person for the rest of the day.”

3. verb

to cause or contribute to feelings of sadness or depression in someone

“The loss of her job depressed her and made her a depressant person.”