threatening
adj 1: 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},
{ugly}]
2: darkened by clouds; "a heavy sky" [syn: {heavy}, {lowering},
{sullen}]