1. (a.) Serving to hinder through fear or threat\.

2. (n.) That which deters or prevents.

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