Not questioned or opposed; accepted without doubt or resistance.
From 'un-' (not) + 'challenged' (from 'challenge,' from Old French 'chalange' meaning to accuse or dispute). The prefix negates the verb, creating an adjective meaning unopposed.
Throughout history, 'unchallenged' authority hasn't lasted long—from ancient Rome to modern times, whenever power goes completely unchallenged, corruption and abuse eventually destabilize even the strongest-seeming empires.
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