1) Corrupt 2) Disjasked 3) Doty 4) Moldered 5) Moth-eaten 6) Rotted 7) Rotten 8) Unsound 1) Damaged by decay 2) Decomposed 3) Disintegrating 4) Fusty 5) Gone-off 6) Hard 7) In bad shape 8) Less radioactive 9) Like many zombies 10) Mouldy 11) Musty 12) Out of date 13) Past its best 14) Past its sell-by date 15) Progressively declined 16) Putrid 17) Rotted 18) Rotted away 19) Rotted or decomposed 
• (a.) Fallen, as to physical or social condition; affected with decay; rotten; as, decayed vegetation or vegetables; a decayed fortune or gentleman. • (imp. & p. p.) of Decay
De·cayed' adjective Fallen, as to physical or social condition; affected with decay; rotten; as, decayed vegetation or vegetables; a decayed fortune or gentleman. -- 
[adj] - damaged by decay 2. [adj] - deteriorated by decay or rot
decayed 1. The organic phenomenon of having rotted. 2. Damaged by decay; hence, unsound and useless. 3. Organic matter which has been destroyed or decomposed; as a result of bacterial or fungal action; that which has become rotten.
rotten adjective damaged by decay; hence unsound and useless; `rotten floor boards`; `rotted beams`; `a decayed foundation`