unregenerate

Adjective
  1. Tenaciously unwilling or marked by tenacious unwillingness to yield (synset 302334687)
  2. Not reformed morally or spiritually (synset 301964264)
    "unregenerate human nature"; "unregenerate conservatism"
  3. Unrepentant and incapable of being reformed (synset 300638447)
    "an unregenerate criminal"

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