insufficiency, lack, inadequacy, want, deficient, deficience, shortfall, defect, imbalance, shortcoming, more...

abundance, surplus, excess, sufficiency, plenty

protein, vitamin, mineral, nutrient, electrolyte, more...

mental, severe, nutritional, dietary, immune, congenital, folic, iron, acid, hydroxylase, serious

lack of something,   a lack,   lack of quality,   a lack of something,   short fall,   inadequacy synonym,   things lacking,   what someone lacks,   what i lack,   excess opposite