damaged by decay; hence unsound and useless; "rotten floor boards"; "rotted beams"; "a decayed foundation"

The breaking down or rotting of organic matter through the action of bacteria, fungi, or other organisms; decomposition.

To undergo decay.

adjective

developing , flourishing , germinating , growing , improving , ripening

adjective

addled , bad , carious , carrion , corroded , decomposed , effete , gangrenous , moldered , overripe , perished , putrefied , putrescent , putrid , rank , riddled , rotted , ruined , spoiled , wasted , withered