an indication or omen of something about to happen, esp. something momentous.

threatening or disquieting significance

an occurrence of dire portent.

a prodigy or marvel.

noun

doom

noun

augury , bodement , boding , caution , clue , foreboding , foreshadowing , foretoken , funny feeling * , handwriting on the wall , harbinger , hunch , omen , premonition , presage , presentiment , prognostic , prognostication , sign , sinking feeling , threat , vibes , warning , marvel , phenomenon , prodigy , sensation , stunner , wonder , forerunner , prefigurement , miracle