1. (a.) Full of unpropitious stellar influences; unpropitious; ill-boding.

2. (a.) Attended with suffering or disaster; very unfortunate; calamitous; ill-fated; as, a disastrous day; a disastrous termination of an undertaking.

appalling awful baneful black calamitous cataclysmal cataclysmic catastrophic consuming consumptive convulsive deadly demolishing demolitionary depredatory desolating destroying destructive detrimental devastating dire doomful dreadful fatal fateful fratricidal grievous hapless harmful harrowing herky-jerky horrendous horrible horrifying internecine jerky luckless nihilist nihilistic orgasmic paroxysmal ravaging ruining ruinous seismic self-destructive spasmodic spastic subversionary subversive suicidal terrible tragic unfortunate unlucky upheaving vandalic vandalish vandalistic wasteful wasting withering wreckful