Despite years of counseling, he remained unregenerate in his selfish habits.

Her unregenerateness surprised everyone who had hoped she had changed.

He unregenerately refused to apologize, blaming everyone else for the mistake.

The unregenerated marshland could not sustain the migratory birds this year.

The coral reef damage was unregenerable after the prolonged bleaching event.

The scientist warned that the unregeneration of the damaged coral reefs threatened the entire marine ecosystem.

The scientist observed the unregenerating tissue under the microscope and noted the lack of cellular repair.