2jēng gwáai 精乖 — smart, bright (usually of children)
3jēng lēk 精叻 — smart, intelligent, capable
4jēng yàhn chèut háu, bahn yàhn chèut sáu 精人出口,笨人出手 — the clever person uses words; the stupid person uses their hands; a smart person gets stupid people to carry out difficult or annoying tasks for them