1. Being good at learning or thinking about things: Mona is a very intelligent, bright, clever, and smart student.
2. Showing exceptional intelligence or good judgment: Tony made a smart move when he accepted the new job that was offered to him.
3. Very fast and energetic: Kevin's mother gave him a smart slap on his bottom when he talked back to her.
4. Things that are controlled by computers which can perform actions that appear to be intelligent: The so-called-smart drones still make too many mistakes.