A forward pass which is not caught inbounds by the intended receiver(noun)
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Use "incompletion" in a sentence
"Tennessee blew chances to build a bigger halftime lead when Shaun Phillips pressured Vince Young into a third-down incompletion from the Chargers 12 that left the Titans settling for a field goal, and Shawne Merriman jarred a fumble from Chris Brown on another drive to the 12, recovered by Phillips."
"The Cavaliers had their chances in the fourth quarter, but couldn't make plays when they counted most, including an incompletion from the 2-yard line on fourth down."
"On Dallas 'first drive, a third-and-11 incompletion from the Detroit 21 turned into a first down courtesy of illegal contact by Lions safety Jon McGraw."