vulnerable (adj.)

"slender, lithe," 1817, svelt, from French svelte "slim, slender" (17c.), from Italian svelto "slim, slender," originally "pulled out, lengthened," past participle of svellere "to pluck or root out," from Vulgar Latin *exvellere, from Latin ex- "out" (see ex-) + vellere "to pluck, stretch," from PIE *wel-no-, suffixed form of *uelh- "to strike" (source also of Hittite ualh- "to hit, strike," Greek aliskomai "to be caught").

heavenly hall in which Odin receives the souls of heroes slain in battle, 1696 (in Archdeacon Nicolson's "English Historical Library"), from Old Norse Valhöll "hall of the battle-slain;" first element from valr "those slain in battle," from Proto-Germanic *walaz (source also of Old English wæl "slaughter, bodies of the slain," Old High German wal "battlefield, slaughter"), from PIE root *wele- (2) "to strike, wound" (source also of Avestan vareta- "seized, prisoner," Latin veles "ghosts of the dead," Old Irish fuil "blood," Welsh gwel "wound"). Second element is from höll "hall," from PIE root *kel- (1) "to cover, conceal, save." Reintroduced by 18c. antiquaries. Figurative sense is from 1845.