A nonquest is a (normally sexual) conquest that never actually happened. Often referred to in the past tense, once you have entered the 'friendzone' with a person you thought you might have had a chance of sleeping with.
'I wish I'd slept with her whilst I had a chance - she's my greatest nonquest'

Man 1: You remember that girl that used to barmaid at the Ships Head?
Man 2: Yeah, she was fit - didn't you get it on with her?
Man 1: No, she was one of my nonquests.
by Edd32 April 26, 2012
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