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Dictionary definition for: Sinister

1. (s) 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 clo

2. (s) 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 sc

3. (s) on or starting from the wearer''s left; "bar sinister"

WordNet 2.1 Copyright Princeton University. All rights reserved.