Synonyms and related words :
alarming, awing, black, bleak, chilling, daunting, depressant, depressing, depressive, despondent, deterrent, deterring, disappointing, disconcerting, discouraging, dismal, dismaying, dispiriting, displeasing, disquieting, dissatisfactory, down, dreary, fear-inspiring, fearful, fearsome, frightening, frightful, funereal, inadequate, incommensurate, insufficient, not good enough, oppressive, overawing, pessimistic, scaring, scary, somber, startling, unfulfilling, ungratifying, unsatisfactory, unsatisfying