Multiple choice Directions: Find the antonym of the word in bold letters. Plenitude: Put up Sort out Inefficiency Dormant Reveal answer Fill a bubble to check yourself C Correct answer Explanation Plenitude means an abundance or a large amount. Inefficiency is a poor antonym here, but among the choices, it is the only one that represents a lack or failure of a positive state, though 'scarcity' would be a better antonym.