The Collaborative International Dictionary of English v.0.48:

Doomful \Doom"ful\, a.
   Full of condemnation or destructive power. [R.] "That doomful
   deluge." --Drayton.
   [1913 Webster]

Moby Thesaurus II by Grady Ward, 1.0:

89 Moby Thesaurus words for "doomful":
   apocalyptic, bad, badly off, baleful, baneful, black, bodeful,
   boding, calamitous, cataclysmal, cataclysmic, catastrophic,
   consuming, consumptive, dark, deadly, demolishing, demolitionary,
   depredatory, depressed, desolating, destroying, destructive,
   devastating, dire, direful, disastrous, donsie, dreary, evil,
   evil-starred, fatal, fateful, foreboding, fortuneless, fratricidal,
   funest, gloomy, hapless, ill, ill off, ill-boding, ill-fated,
   ill-omened, ill-starred, in adverse circumstances, inauspicious,
   internecine, lowering, luckless, menacing, nihilist, nihilistic,
   of evil portent, ominous, out of luck, planet-struck, portending,
   portentous, ravaging, ruining, ruinous, sad, self-destructive,
   short of luck, sinister, somber, star-crossed, subversionary,
   subversive, suicidal, threatening, unblessed, underprivileged,
   unfavorable, unfortunate, unhappy, unlucky, unpromising,
   unpropitious, unprosperous, unprovidential, untoward, vandalic,
   vandalish, vandalistic, wasteful, wasting, withering