hellish (adj.)youdaoicibaDictYouDict[hellish 词源字典]
1520s, from hell + -ish. Related: Hellishly; hellishness. Earlier in same sense were helli "helly" (late 12c.); hellen "hellish, infernal" (c. 1200), with -en (2); and Old English hellic.[hellish etymology, hellish origin, 英语词源]