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assertiveness  
aggressiveness, confidence, decidedness, decisiveness, dogmatism, domineeringness, firmness, forcefulness, forwardness, insistence, positiveness, pushiness  (informal) self-assuredness 
 
Antonyms  
 backwardness, bashfulness, diffidence, hesitancy, insecurity, meekness, modesty, reservedness, self-consciousness, self-effacement, sheepishness, shyness, tentativeness, timidity, timidness, timorousness