The Collaborative International Dictionary of English v.0.48:
Unhardened \Unhardened\ See hardened.WordNet (r) 3.0 (2006):
unhardened adj 1: not brought to a proper consistency or hardness; "untempered mortar"; "untempered steel" [syn: untempered, unhardened] [ant: hardened, tempered, toughened, treated]