THESAURUS
deterrent
admonishing, admonitory, alarming, awing, bar, block, blockade, bottleneck, catch, cautionary, cautioning, check, chill, chilling, cold water, cordon, curtain, damp, damper, daunting, determent, deterring, difficulty, disconcerting, discouragement, discouraging, disheartening, disincentive, disinclining, dismaying, disquieting, dissuading, dissuasion, dissuasive, drawback, exemplary, expostulatory, fear-inspiring, fearful, fearsome, forbidding, forestalling, frightening, frightful, hang-up, hazard, hindrance, hitch, hurdle, impediment, intimidating, joker, monitorial, monitory, notificational, notifying, objection, obstacle, obstruction, obstructive, one small difficulty, overawing, preclusive, preventative, preventive, prohibitive, prophylactic, rub, scaring, scary, snag, startling, stumbling block, stumbling stone, warning, wet blanket