The merchant proceeded on his way marvelling in his heart at the uncharitableness and innate wickedness of unregenerated human nature.
Source: wiktionary
Ranked by relevance and common usage.
Keep "unregenerated" when the sentence already sounds natural, when a synonym would add unintended emphasis, or when readers need the most familiar wording. A synonym should clarify or sharpen the message, not simply make the sentence look more varied.
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2 total sentences available.
The merchant proceeded on his way marvelling in his heart at the uncharitableness and innate wickedness of unregenerated human nature.
Source: wiktionary
The houses themselves are so horrible in their condition, and have been so remodeled from time to time, to meet Celestial ideas and fall in with notions which are but a relic of barbarism, that not even a colored man of the most degraded type can be persuaded to live permanently in a house which has ever been occupied by an unregenerated denizen of Chinatown.
Source: wiktionary
Closest matches include unregenerate.
Compare the replacement against real sentence context. This entry includes sample sentences so you can check tone, grammar, and meaning before swapping words.