傻 (shǎ): ngu ngốc

He actually told his bank card password to a netizen he had just met; everyone thought he was too foolish.

Are you foolish? On such a cold day you're wearing only a shirt—what if you catch a cold?

My little sister smiled foolishly as she gave me the last piece of cake, while secretly licking her fingers.

Don't be foolish—he doesn't like you at all. Is it worth doing so much for him?