The Collaborative International Dictionary of English v.0.48:

Unsoftened \Unsoftened\
   See softened.

Moby Thesaurus II by Grady Ward, 1.0:

20 Moby Thesaurus words for "unsoftened":
   callous, hard, hardened, impenitent, insolent, obdurate, unabated,
   unabject, unallayed, uncontrite, unextinguished, unmelted,
   unmitigated, unquelled, unquenched, unrepentant, unrepenting,
   unsubdued, untempered, untouched