In Decline' is a term used to describe a situation in which something is gradually decreasing in amount or quality. WANING, with 6 letters, is a synonym for decline, and means to gradually decrease in strength or intensity. WORSE, with 5 letters, is another word for decline, and means to become WORSE or of lower quality. EBBING, with 6 letters, is yet another word for decline, and means to gradually lessen in intensity or strength. On the wane, with 9 letters, is a phrase that means to be in a state of decline or to be decreasing in strength or intensity. On the skids, with 10 letters, is an expression that means to be in a state of decline or to be deteriorating. LANGUISHING, with 11 letters, is a word that means to be in a state of neglect or disrepair, or to be in a state of decline.