have one's head screwed on right

have (one's) head screwed on (right)

To have sound judgment. I'm not surprised that Melissa invests most of her paycheck instead of spending it frivolously because she's always had her head screwed on right.See also: have, head, on, screw

have one's head screwed on right

see under have a screw loose. See also: have, head, on, right, screw