Longman Dictionary of Contemporary English homepage

Date: 1600-1700
Language: Latin
Origin: sanus 'healthy, sane'

sane

adjective
     
sane
1HBH 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.
2 reasonable and based on sensible thinking:
a sane and sensible approach to gun control
3

keep somebody sane

also stay/remain saneMP to stop someone from thinking about their problems and becoming upset:
The only thing that kept me sane was music.
sanely adverb

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