How to say "Describing a thin person: slim vs. skinny" in English
You want to say someone is thin, but not insult them. 'Slim' and 'skinny' sound close—until you use them on a real person.
slim
positive, polite, or admiring
skinny
negative, worried, or a little rude
The verdict
If you want to be kind, say slim. Skinny often sounds critical or like you think someone is too thin.
slim: in use
She looks so slim in that dress.
skinny: in use
He got really skinny after being sick.
Skip: "thin" — Sounds clinical or even sickly—nobody uses it as a compliment.
Stick with slim unless you mean it as a warning, not a compliment.