1 abysmal, alarming, appalling, deplorable, dire, distressing, dreadful, fearful, frightful, from hell (informal) ghastly, godawful (slang) gruesome, harrowing, hellacious (U.S. slang) hideous, horrendous, horrible, horrid, horrific, horrifying, nasty, shocking, terrible, tremendous, ugly, unpleasant, unsightly
2 (archaic) amazing, awe-inspiring, awesome, dread, fearsome, majestic, portentous, solemn
1 amazing, brilliant, excellent, fabulous (informal) fantastic, great (informal) magnificent, marvellous, miraculous, sensational (informal) smashing (informal) super (informal) superb, terrific, tremendous, wonderful