Synonyms and related words :
admonitory, alarming, awing, black, bleak, cautionary, chilling, daunting, depressant, depressing, depressive, deterrent, deterring, disconcerting, disheartening, disinclining, dismal, dismaying, dispiriting, disquieting, dissuading, dissuasive, down, dreary, expostulatory, fear-inspiring, fearful, fearsome, forbidding, forestalling, frightening, frightful, hindering, intimidating, monitory, oppressive, overawing, preclusive, preventative, preventive, prohibitive, prophylactic, scaring, scary, startling,