1.Definition: not reformed morally or spiritually

"Unregenerate human nature", "Unregenerate conservatism"

Related Adjective(s):unregenerated

2.Definition: tenaciously unwilling or marked by tenacious unwillingness to yield

Related Adjective(s):obstinate, stubborn

3.Definition: unrepentant and incapable of being reformed

"An unregenerate criminal"

Related Adjective(s):unreformable