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.