the.com/maniac

Someone whose enthusiasm hasn't met a brake pedal it respects.

means A person driven to wild, frenzied extremes of behavior or passion — or, loosely, anyone whose energy and intensity run way past normal limits.

from From Latin 'maniacus,' which came from Greek 'mania' meaning madness or frenzy — itself likely tied to 'mainesthai,' to rage or be furious, possibly connected to roots meaning 'mind' or 'spirit' gone unmoored. The word entered English through medical Latin describing violent insanity, and only later loosened its collar to cover anyone — sports fans, shopaholics, workout enthusiasts — whose devotion simply refuses to idle.

original meaning
once a clinical term for violent insanity
now means
your friend who runs marathons for fun
etymology
from greek mania, meaning divine frenzy
pop culture
flashdance made it a workout anthem
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