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untempered (adj.)

mid-15c., "not properly mixed, undiluted," from un- (1) "not" + past participle of temper (v.). Similar formation in Middle Dutch ongetempert, Middle High German ungetempert. Earlier as "unrestrained" (late 14c.), also, of a musical instrument, "not properly tuned;" meaning "unhardened" is from 1820.

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Definitions of untempered from WordNet

untempered (adj.)
not brought to a proper consistency or hardness;
untempered steel
untempered mortar
Synonyms: unhardened
untempered (adj.)
not moderated or controlled;
his untempered individualism
From wordnet.princeton.edu