One entry found for sinister.

Main Entry: sin·is·ter
Pronunciation: sin-s-tr
Function: adjective
Etymology: Middle English sinistre "unlucky, unfavorable," from Latin sinistr-, sinister "left, on the left side, awkward, unfavorable"; so called because the ancient Romans believed that omens seen on the left side told of bad things to come
1 : especially evil or leading to evil : BAD
2 : threatening evil, harm, or danger : OMINOUS
- sin·is·ter·ly adverb