Q-ness
Q-ness was an attribute that a  should have. According to Q, 'Q-ness' was an ideal that was too difficult for a Human to understand.

After Q Junior gave a speech to show what he had learned to Kathryn Janeway and Q in 2378, Q thought that the speech did not show any 'Q-ness'. ()
de:Qigkeit
Q Continuum
Philosophy