hurtful

From hurt + ful. hurt comes from Middle English hurten, hirten, hertan (“to injure, scathe, knock together”), from fro-nor hurter "to ram into, strike, collide with"; > Modern French heurter, perhaps from Frankish hūrt (“a battering ram”), cognate with Welsh hwrdd (“ram”) and kw hordh (“ram”). Compare Proto-Germanic hrūtaną, hreutaną (“to fall, beat”), from Proto-Indo-European krew- (“to fall, beat, smash, strike, break”); however, the earliest instances of the verb in Middle English are as old as those found in Old French, which leads to the possibility that the Middle English word may instead be a reflex of an unrecorded Old English hyrtan, which later merged with the Old French verb. Germanic cognates include Dutch horten (“to push against, strike”), Middle Low German hurten (“to run at, collide with”), Middle High German hurten (“to push, bump, attack, storm, invade”), Old Norse hrútr (“battering ram”). Alternate etymology traces fro-nor hurter rather to Old Norse hrútr (“ram (male sheep)”), lengthened-grade variant of hjǫrtr (“stag”), from Proto-Germanic herutuz, herutaz (“hart, male deer”), which would relate it to English hart (“male deer”). See hart.

Etymology from Wiktionary, CC BY-SA