Believe it or not metanoia been discussed in this forum previously (if briefly). See here.
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METANOIA

PRONUNCIATION: (met-uh-NOI-uh)

MEANING: noun: A profound transformation in one’s outlook.

ETYMOLOGY: From Greek metanoia (a change of mind), from metanoein (to change one’s mind). Earliest documented use: 1577.
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METHANOIA (1) - the sense of persecution that accompanies amphetamine use

METHANOIA (2) - certainty that cow flatulence is omnipresent...and deliberate

MELANOIA - the conviction that one is going to die from a sun-related skin cancer