have one's head screwed on

Verb

 * 1)  To be a sensible thinker capable of making sound decisions.

Translations

 * Finnish: olla järjissään
 * French:, garder la tête sur les épaules
 * Italian: avere la testa sulle spalle, avere la testa a posto
 * Polish:
 * Spanish: tener la cabeza en su sitio