fateful (adj.)

• acute
• apocalyptic
• appointed
• awe-inspiring
• bad
• baleful
• baneful
• black
• boding
• calamitous
• cataclysmal
• cataclysmic
• catastrophic
• certain
• conclusive
• consequential
• consuming
• consumptive
• critical
• crucial
• dark
• deadly
• decisive
• destined
• destroying
• destructive
• determinative
• devastating
• devoted
• dire
• direful
• disastrous
• doomed
• dreary
• earnest
• evil
• fatal
• fated
• foreboding
• formidable
• gloomy
• grave
• heavy
• ill
• ill-fated
• ill-omened
• ill-starred
• important
• imposing
• inauspicious
• indefeasible
• ineluctable
• inescapable
• inevitable
• inexorable
• inflexible
• internecine
• irresistible
• irrevocable
• lethal
• lowering
• major
• marked
• menacing
• momentous
• necessary
• nihilistic
• ominous
• ordained
• pivotal
• portentous
• ravaging
• relentless
• resistless
• ruinous
• self-destructive
• serious
• significant
• sinister
• sober
• solemn
• somber
• subversive
• suicidal
• sure
• threatening
• unavoidable
• uncontrollable
• unfavorable
• unfortunate
• unlucky
• unpreventable
• unpromising
• unpropitious
• unstoppable
• untoward
• unyielding
• wasteful
• weighty
• withering
• written