too good to be true

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).

Nearby words

too, too bad, too big for one's britches, too close for comfort, too close to call, too good to be true, too little, too late, too many cooks spoil the broth, too many irons in the fire, too much of a good thing, too-too

Examples from the Web for too good to be true

But in a quick look at eBay one finds plenty of too-good-to-be-true art auctions.
Why eBay Is an Art Forger’s Paradise|Lizzie Crocker|August 19, 2014|DAILY BEAST
She had no reason to trust this stranger and his too-good-to-be-true offer.
How An Israeli Stranger Helped An Ethiopian Girl Escape Prostitution|Itay Hod|February 9, 2014|DAILY BEAST
As with all too-good-to-be-true mysteries, scientists have a simple explanation for this wall of wonder.
294 Dinosaurs Once Walked on This Wall in Bolivia|Nina Strochlic|October 24, 2013|DAILY BEAST