tempered (adj.)youdaoicibaDictYouDict[tempered 词源字典]
1650s, "brought to desired hardness" (of metals, especially steel), past participle adjective from temper (v.). Meaning "toned down by admixture" is from 1650s; of music or musical instruments, "tuned," from 1727.[tempered etymology, tempered origin, 英语词源]