1.
[syn: baleful, forbidding, menacing, minacious, minatory, ominous, sinister, threatening]
The Collaborative International Dictionary of English v.0.48:
Minacious \Mi*na"cious\, a. [L. minax, -acis. See Menace.]
Threatening; menacing. [R.]
[1913 Webster]
WordNet (r) 3.0 (2006):
minacious
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, threatening]