wiseacre – a person who pretends to possess knowledge or wisdom, to the annoyance of others

(Pronounced why-zay-kuh)

To remember the definition of the word wiseacre, use the following mnemonic:

It wasn't wise to plant acres (wiseacre) of crops in the arctic. The farmer pretended to know what she was doing, but it was beginning to annoy the others. 

Examples of wiseacre in a sentence

The man selling a miracle cure turned out to be a wiseacre selling snake oil. 

The wiseacre next door had pretended to be an expert on just about every topic. 

They eventually had to ask the wiseacre to leave when he wouldn't stop bothering people with made up trivia.