threatening or foreshadowing evil or tragic developments; a baleful look; forbidding thunderclouds; his tone became menacing; ominous rumblings of discontent; sinister storm clouds; a sinister smile; his threatening behavior; ugly black clouds; the situation became ugly

[ Syn: baleful , forbidding , menacing , minacious , minatory , ominous , sinister ]

darkened by clouds; a heavy sky

[ Syn: heavy , lowering , sullen ]