Way 1 · best compliment
slim
Thin in an attractive, healthy way. The safe word to use about someone's body.
Examples
You look really slim in that dress.
He's tall and slim, with short dark hair.
In a conversation
A: Be honest. Do I look OK in this?
B: You look great. That cut makes you look really slim.
Common mistake
Not: She is very skinny, so beautiful.
Say: She's very slim and really beautiful.
"Skinny" can suggest too thin. As a compliment, "slim" is always safer.