the.com/insanity

Doing the same thing twice and blaming the thing when it fails again.

means A state of mind so unsound — whether medically, legally, or just in the heat of frustration — that it departs from reason or sense.

from From Latin insanitas, built from in- ('not') plus sanitas ('health, soundness') — the same sanitas that gives us 'sanity' and 'sane.' Sanus originally meant physically healthy or whole, so insanity's oldest sense was simply 'unhealthiness,' long before it narrowed to mean unsoundness of mind specifically.

legal term
not knowing right from wrong, not just unusual behavior
famous misquote
Einstein never actually said the repetition line
clinical reality
psychiatry retired the word, prefers specific diagnoses instead
everyday use
usually just means stubborn, not mentally ill
the.com · every word