decayed, rotten, rotted - damaged by decay; hence unsound and useless; "rotten floor boards"; "rotted beams"; "a decayed foundation" Antonym:sound (indirect, via unsound)
Verbdecay has 3 senses
disintegrate, decay, decompose - lose a stored charge, magnetic flux, or current; "the particles disintegrated during the nuclear fission process" --1is one way tochange integrity