aging (part of speech: verb)
deteriorating (part of speech: verb)
degenerating, dilapidating, sinking, falling apart, fading, going downhill, collapsing, mouldering, putrefying, slumping, worsening, regressing, ebbing, slipping, relapsing, getting worse, wilting, downgrading, retrogressing, sliding, tergiversating, waning, withering, reverting, atrophying, lapsing, decaying
- In the Mysteries performed on the physical plane these used to be dramatically represented, and the ceremonies followed in many respects " the pattern" ever shown forth " on the Mount," for they were the shadows in a deteriorating age of the mighty Realities in the spiritual world. - "Esoteric Christianity, or The Lesser Mysteries", Annie Besant.
- The comforts of our poor Highlander have been deteriorating, and his position lowering, for the last three ages, and we see no prospect of improvement. - "Leading Articles on Various Subjects", Hugh Miller.
- Even with his past experience- the depressing, deteriorating effects, mental and physical, of years of poverty in its most squalid and depressing form, " shabby- genteel" poverty- he realized that even the possession of wealth might leave something to be desired. - "The Sign of the Spider", Bertram Mitford.