n. The state or quality of being enormous, immoderate, or extreme; atrociousness; vastness: in a bad sense: as, the enormity of his offense.n. Enormousness; immensity: without derogatory implication.n. That which surpasses endurable limits, or is immoderate, extreme, or outrageous; a very grave offense against order, right, or decency; atrocious crime; an atrocity.n. Synonyms and Enormity, Enormousness. Enormousness is strictly limited to vastness in size; enormity, to vastness in atrocity, baseness, etc.