impending

This word carries a heavy sense of inevitability and dread. It is rarely used for happy events; you would not typically speak of an impending birthday party, but you would speak of an impending disaster. The feeling is one of a looming shadow or a countdown toward an unavoidable conclusion.

In professional or legal settings, it describes a state of high anticipation and preparation for a critical event. It suggests that the event is not just possible, but certain, creating a psychological atmosphere of tension and urgency.