appalling, atrocious, awful, dreadful, frightful, ghastly, grisly, gruesome(also grewsome), hideous, horrendous, horrible, horrid, horrific, horrifying, lurid, macabre, monstrous, nightmare, shocking, terrible, terrific

alarming, bloodcurdling, dire, direful, fearful, fearsome, forbidding, formidable, frightening, gut-wrenching, hair-raising, heart-stopping, intimidating, redoubtable, scary, terrifyingabhorrent, deplorable, disagreeable, disgusting, distasteful, loathsome, nauseating, noisome, obnoxious, obscene, offensive, repugnant, repulsive, revolting, sickeningabominable, evil, foul, heinous, noxious, odious, unspeakable, vilegrotesque, ugly, unsightly

agreeable, appealing, attractive, delectable, delicious, delightful, enjoyable, enticing, inviting, pleasant, pleasing, pleasurable, satisfying, welcomecheering, comforting, soothing