too good to be true

Idioms  

1. So excellent that it defies belief, as in She loves all her in-laws? That's too good to be true. This term expresses the skeptical view that something so seemingly fine must have something wrong with it. The term was part of the title of Thomas Lupton's Sivquila; Too Good to be True (1580).

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Example Sentences

"More people are getting sucked in by the scammers offering prices that are too good to be true."

From BBC

Be on the lookout for anything that seems too good to be true.

From MarketWatch

A spokesperson said in the first three months of the year it had seen more than over £74,000 in travel-related scams, with fraudsters using fake tickets, cloned websites and "too good to be true deals" to target consumers.

From BBC

“Most of us are careful if a stranger approaches us on the street and offers a deal that seems too good to be true. But we’re much less cautious online, which can put us at risk,” the company says.

From MarketWatch

Regan’s plea agreement, filed on Friday, stated that after the Journal’s first article came out, he “held a videoconference with Yield salespeople” to dismiss concerns that “the product was too good to be true.”

From The Wall Street Journal