1. Mute or unable to speak: "sourd-muet"
2. Stupid or unintelligent: "stupide" or "bête"
3. Silent or not speaking: "muet"
4. Dumbfounded or speechless: "bouche bée" or "sidéré"
Here are some examples:
* He's deaf and dumb. - Il est sourd-muet.
* That was a dumb thing to do. - C'était stupide de faire ça.
* She's been so dumb lately. - Elle a été si bête ces derniers temps.
* I was dumbstruck by the news. - J'étais bouche bée par la nouvelle.
It's important to choose the right word based on the specific meaning you want to convey.