Longman Dictionary of Contemporary English homepage

Date: 1400-1500
Language: Old French
Origin: sinistre, from Latin sinister 'left-handed, unlucky'

sinister

 adjective
     
sin‧is‧ter
making you feel that something evil, dangerous, or illegal is happening or will happen
there is something/nothing sinister about somebody/something
There was something sinister about Mr Scott's death.
There is a sinister side to these events.
He was a handsome man in a sinister sort of way.
a sinister atmosphere
Definition from the Longman Dictionary of Contemporary English
Advanced Learner's Dictionary.

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