waštu  (alṭu)

: stiff , hard , difficult 1) (parts of the body) : stiff 2) (walls, roads ...) : hard , difficult 3) (persons -especially the ennemy-) : headstrong , obdurate 4) (deity, divine onslaught, flood, wind ...) : unyielding , unrelenting , giving no respite

See also : waštu, ašṭūtu, uššuṭu, muttaššiṭu, šiddu