Here are some sentences.
The sinister magician turned the prince into a frog.
His sinister plans were thwarted by the superhero.
Her sinister eyes glared at him from across the room.
The villain displayed a sinister grin, then left the stage.
The plotting of the evil woman was sinister.
The witch had her minions carry out the sinister plot to murder the royal family.
The castle appeared black and sinister, it rose forbiddingly above a forest of dead trees.
The fugitive's plan was sinister. The sinister plan was too shocking to repeat.
The bully looked at me with a sinister intent; I just knew he was coming after my lunch money.
Context clues are clues in the surrounding sentences that help you figure out an unknown word. Example: say you do not know what sinister means..... The sinister man spits on puppy's and steals other peoples belongings. From this sentence you can conclude sinister means bad/evil.
The host's sinister Halloween costume was really made complete with it's false, clammy hand.
sinister can be used as a prefix (or alone) and does not have one itself
Sinister actually means left, as in the left side. The modern meaning of "evil" comes from the old belief that the left side was the "wrong" side (as opposed to the right side). Here are some sentences using both meanings.Use these drops in the sinister eye for three weeks to cure your infection.The scientist's lab was sinister looking.Dexter means right and sinister means left.
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. Source: Dictionary.com