Britannica Dictionary definition of SANITY
[noncount]
1
:
the condition of having a healthy mind
:
the condition of being sane
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People have begun to doubt his sanity.
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She is the mother of six children but somehow keeps her sanity.
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I need a vacation to regain/recover my sanity. [=to begin to feel normal and relaxed again]
—
opposite insanity
2
:
the condition of being based on reason or good judgment