Definition of flyness in US English:

flyness

noun

informal
  • See fly

    • ‘If you're looking for the suit that will make you look like a celebrity, with a little bit of "flyness" to it, then this is it!’
    • ‘He shared his neighbours' fundamental piety, their flyness, their brusque manners and their vigorous speech.’
    • ‘Appearance is important but how many times have you seen some fly girl or guy and then when they open their mouth their flyness is overshadowed by their lack of substance.’
    • ‘I have to give it to him; for a dude in his 40’s he is the epitome of flyness.’
    • ‘your page is so live and professional, that I did not want to ruin its flyness.’