Sane (adjective)

1. In possession of a rational and healthy mind; not insane.
2. Having a sound and healthy mind; not affected by a disorder of the mind.
3. Having a sound judgement, reasonable and rational.

Origin:

From middle english, from old english gesæne, from sæne ("healthy, whole"), from proto-germanic *sēnaz ("healthy, whole"), from proto-germanic *sēnan ("to heal"), from proto-indo-european *sóh₁nós ("safe, unharmed").

Examples:

1. Despite the tragic loss, he remained sane and composed.
2. It is not sane to jump from a plane without a parachute.
3. The judge deemed the suspect sane enough to stand trial.
4. After a long day at work, a good night's sleep helps keep me sane.
5. It"s sane to take a break when you"re feeling overwhelmed.