Antonyms of adj unhardened

1 sense of unhardened

Sense 1
untempered (vs. tempered), unhardened -- (not brought to a proper consistency or hardness; "untempered mortar"; "untempered steel")


Similarity of adj unhardened

1 sense of unhardened

Sense 1
untempered (vs. tempered), unhardened -- (not brought to a proper consistency or hardness; "untempered mortar"; "untempered steel")
       => brittle, unannealed -- ((of metal or glass) not annealed and consequently easily cracked or fractured)