Synonyms for Negativity (same or very similar meaning)
WordNet sense 1 (the character of the negative electric pole):
negativenessWordNet sense 2 (characterized by habitual skepticism and a disagreeable tendency to deny or oppose or resist suggestions or commands):
negativismWordNet sense 3 ((chemistry) the tendency of an atom or radical to attract electrons in the formation of an ionic bond):
electronegativityFrom the ODE community, based on WordNetadd/edit