Jisho

Did you check the definition here at this dictionary website we're on? :)

welp who would have thought sumaato also mean slim xD i only know thks to this question here.

And just to be clear, the only other meaning is "smart" in the sense of "stylish". スマート has no relation to intelligence in Japanese.

This is the primary meaning of スマート
Japanese people will not understand it if you try to use it to mean かしこい or あたまがいい