unhardened vs untempered

unhardened and untempered both are adjectives.

Word	Noun	Adjective	Verb	Adverb
unhardened	No	Yes	No	No
untempered	No	Yes	No	No

As adjectives, unhardened and untempered are synonyms defined as:

unhardened and untempered: not brought to a proper consistency or hardness

unhardened (adjective)	untempered (adjective)
not brought to a proper consistency or hardness	not moderated or controlled
	not brought to a proper consistency or hardness