sinister

adjectives

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"
baleful, forbidding, menacing, minacious, minatory, ominous, sinister, threatening
stemming from evil characteristics or forces; wicked or dishonorable
"black deeds"; "a black lie"; "his black heart has concocted yet another black deed"; "Darth Vader of the dark side"; "a dark purpose"; "dark undercurrents of ethnic hostility"; "the scheme of some sinister intelligence bent on punishing him"-Thomas Hardy
black, dark, sinister
on or starting from the wearer's left
"bar sinister"
sinister
is similar to
of or on the left
"a sinistral gastropod shell with the apex upward has its opening on the left when facing the observer"; "a sinistral flatfish lies with the left eye uppermost"
sinistral
domain category
the study and classification of armorial bearings and the tracing of genealogies
heraldry