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Meaning of sinister

sin•is•ter

Pronunciation: (sin'u-stur), [key]
— adj.
  1. threatening or portending evil, harm, or trouble; ominous: a sinister remark.
  2. bad, evil, base, or wicked; fell: his sinister purposes.
  3. unfortunate; disastrous; unfavorable: a sinister accident.
  4. of or on the left side; left.
  5. noting the side of an escutcheon or achievement of arms that is to the left of the bearer (opposed to dexter).
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.
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