Archaic form meaning infamous or known for bad deeds; bringing disgrace or notoriety.
From en- plus 'famous,' creating a word that paradoxically meant both famous and infamously bad, similar to how 'infamous' later specialized to mean only the negative sense.
The prefix 'en-' doesn't always intensify meaning in a positive way—'enfamous' showed that making something 'famous' could be bad, which is why we developed 'infamous' as a clearer term for negative fame.
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