"Illdisposedness" is a rather uncommon word in the English language, meaning a state of being in a bad mood or feeling discontented. Its antonyms, however, include a range of words which can describe various positive emotions or states of mind. Some possible antonyms for "illdisposedness" are "contentment," "satisfaction," "pleasure," "cheerfulness," "happiness," "joyfulness," "calmness," and "tranquility." These words represent an opposite state of being where an individual is content, happy, peaceful, and positive. Using these antonyms can help one express gratitude and satisfaction, promoting a positive mindset and improving overall mood and mental wellbeing.