Word Origin & History
terribleearly 15c., "causing terror, frightful," from O.Fr. terrible (12c.), from L. terribilis "frightful," from terrere "fill with fear," from PIE base *tres- "to tremble" (cf. Skt. trasati "trembles," Avestan tarshta "feared, revered," Gk. treëin "to tremble," Lith. triseti "to tremble," O.C.S. treso
EXPAND"I shake," M.Ir. tarrach "timid"). Weakened sense of "very bad, awful" is first attested 1590s.
COLLAPSE