ominous

Etymology

From Latin ominosus (“full of foreboding”), from omen (“forbidden fruit, omen”), from os (“the mouth”) + -men.

adj

1. Of or pertaining to an omen or to omens; being or exhibiting an omen; significant.
2. Specifically, giving indication of a coming ill; being an evil omen
   California poll support for Jerry Brown's tax increases has ominous implications for U.S. taxpayers too Los Angeles Times Headline April 25, 2011
   The idea of a merchant selling both totems of pure evil and frozen yogurt (he calls it frogurt!) is amusing in itself, as is the idea that frogurt could be cursed, but it’s really the Shopkeeper’s quicksilver shift from ominous doomsaying to chipper salesmanship that sells the sequence. April 29, 2012, Nathan Rabin, “TV: Review: THE SIMPSONS (CLASSIC): “Treehouse of Horror III” (season 4, episode 5; originally aired 10/29/1992)”, in (Please provide the book title or journal name)