Answer:

sinister

Answer	Crossword Clue
SINISTER	Menacing
SINISTER	Ominous
SINISTER	Disquieting

SINISTER	Villainous
SINISTER	Evil
SINISTER	Base
SINISTER	Like Snidely Whiplash
SINISTER	Foreboding
SINISTER	Up to no good
SINISTER	Bad
SINISTER	Vincent Price's screen personality.

SINISTER	Left.
SINISTER	Ominous.
SINISTER	Underhand.
SINISTER	On the left side.
SINISTER	Portentous.
SINISTER	A bar of undistinction.
SINISTER	Evil.
SINISTER	Corruptive.

SINISTER	Malefic; baleful
SINISTER	Left
SINISTER	Mackenzie's "... Street"
SINISTER	Presaging trouble
SINISTER	Dark
SINISTER	The Fall "Bend ..."
SINISTER	On the left side, in Latin
SINISTER	Threatening