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.
Sinister--suggesting evil or trouble her sinister smile showed people she didn't have good intentions
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 bully looked at me with a sinister intent; I just knew he was coming after my lunch money.
The host's sinister Halloween costume was really made complete with it's false, clammy hand.
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.
The fugitive's plan was sinister. The sinister plan was too shocking to repeat.
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
The root word of "sinister" is the Latin word "sinister," which means left or on the left side. Over time, the term took on negative connotations and came to be associated with things that are evil, threatening, or ominous.