|Origin:||sanus 'healthy, sane'|
able to think in a normal and reasonable way [≠ insane, mentally ill; ↪ sanity]:
He seems perfectly sane (=completely sane) to me.
No sane person would want to kill a baby.
reasonable and based on sensible thinking:
a sane and sensible approach to gun control
3 also stay/remain saneMP
to stop someone from thinking about their problems and becoming upset:
The only thing that kept me sane was music.