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DictionaryRoot: sanus
Latin

sanus

healthy, sound

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A person tries to launch a bicycle off a rooftop with no landing place while shocked friends reach out to stop the dangerously irrational act.
adjective

insane

in-SAYN/ɪnˈseɪn/

Severely disconnected from sound judgment or reality.

Etymology
inLatinnot; without
+saneLatinhealthy, sound

The literal image is ‘not healthy,’ specifically applied to the mind. From describing mental unsoundness, English extended insane to actions judged irrational or extremely foolish.

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