Forbidding is a word used to describe something that gives the impression of being intimidating, unapproachable or hostile. Some synonyms for forbidding include menacing, ominous, daunting, unfriendly, inhospitable, austere, uninviting, stern, severe and bleak. Menacing and ominous emphasize the sense of impending danger or threat. Daunting is used to describe something that is intimidating or discouraging. Unfriendly, inhospitable and uninviting suggest that something is not welcoming or warm. Austere, stern and severe imply a lack of comfort or ease. Finally, bleak is used to describe something that is desolate or hopeless. All of these words can be used interchangeably with forbidding depending on the context.