The term 'on the decline' can be described by several words, such as 'WANING, ' 'WORSE, ' 'ASLOPE, ' 'FADING, ' and 'DECADENT.' WANING means to gradually decrease in size, strength, or intensity. WORSE is the comparative form of bad, meaning something is of a lower quality than before. ASLOPE is an adjective meaning slanting or inclined. FADING means to become weaker or less distinct over time. Finally, DECADENT is an adjective meaning having fallen into a state of decay or decline. All of these words describe a situation that is deteriorating or on the decline.