1.  negativeness(n = noun.linkdef) negativity - the character of the negative electric pole;
is a kind of polarity, sign
Antonym: positiveness

2.  negativeness(n = noun.attribute) negativism, negativity - characterized by habitual skepticism and a disagreeable tendency to deny or oppose or resist suggestions or commands;
is a kind of quality
Antonym: positiveness
Derived forms adjective negative₂, adjective negative₃

3.  negativeness(n = noun.attribute) negativity - an amount less than zero;
is a kind of amount
Antonym: positiveness
Derived form adjective negative₆

   The quality or state of being negative. [1913 Webster]

N  inexistence, nonexistence, nonsubsistence, nonentity, nil, negativeness, nullity, nihility, nihilism, tabula rasa, blank, abeyance, absence, no such thing, nonbeing, nothingness, oblivion, annihilation, extinction, extinguishment, extirpation, Nirvana, obliteration, inexistent, nonexistent, negative, blank, missing, omitted, absent, insubstantial, shadowy, spectral, visionary, unreal, potential, virtual, baseless, in nubibus, unsubstantial, vain, unborn, uncreated, unbegotten, unconceived, unproduced, unmade, perished, annihilated extinct, exhausted, gone, lost, vanished, departed, gone with the wind, defunct, fabulous, ideal, supposititious &c, negatively, virtually, non ens.