Definition of Slim

Adjective: slim (slimmer,slimmest) slim

Being of delicate or thin build
"a slim girl with straight blonde hair";
- slender, slight, svelte
Small in quantity
"a slim chance of winning";
- slender

Verb: slim (slimmed,slimming) slim

Take off weight
- reduce, melt off, lose weight, slenderize, thin, slim down, slenderise [Brit]