Avidness, meaning enthusiasm or eagerness, has several antonyms that indicate a lack of interest or indifference. Some of these antonyms include apathy, disinterest, indifference, lethargy, listlessness, and indifference. Apathy is a term used to describe a lack of interest, concern, or emotion towards a subject or activity. Disinterest is a state of mind where an individual does not care about something or is not attracted to it. Lethargy is a physical and mental state where an individual feels sluggish or devoid of energy. Listlessness is a mood characterized by a lack of interest, enthusiasm, or zest for anything. Indifference refers to a lack of concern or interest in something.