See terrific in Webster's New World Roget's A-Z Thesaurus II
Causing great horror:
bloodcurdling, hair-raising, horrible, horrid, horrific. See fearExceptionally good of its kind:
ace, banner, blue-ribbon, brag, capital, champion, excellent, fine1, first-class, first-rate, prime, quality, splendid, superb, superior, tiptop, top. (Informal) A-one, bully, dandy, great, swell, topflight, topnotch. (Slang) boss. (Chiefly British) tophole. See goodParticularly excellent:
divine, fabulous, fantastic, fantastical, glorious, marvelous, sensational, splendid, superb, wonderful. (Informal) dandy, dreamy, great, ripping, super, swell, tremendous. (Slang) cool, groovy, hot, keen1, neat, nifty. Idiom: out of this world. See goodLearn more about terrific