"Sem graça" is a good term to know since it's applicable in a few situations. If you think of "graça" coming from the word "engraçado," which means funny, you should be able to remember the different meanings. Let's take a look.

1. Not funny

Este filme é sem graça. This movie isn't funny.

Ele não riu da piada sem graça. He didn't laugh at the joke that wasn't funny.

2. Lame

3. Irritated, annoyed, aggravated

Eu fiquei sem graça porque a minha namorada estava falando com um homem na boate. I got irritated because my girlfriend was talking to a guy at the club.