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say it: SIN-i-stur
sinister is an adjective meaning "threatening or foreshadowing evil or tragic developments". It carries 3 recorded senses.
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”
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”
Definitions, synonyms and semantic relations for sinister come from Princeton University’s WordNet. The pronunciation comes from the CMU Pronouncing Dictionary. Commonness is measured against a corpus of everyday English. Full sources and licences.