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1. Damaged by decay; hence unsound and useless
   "a decayed foundation"
   - rotten, rotted

1. Lose a stored charge, magnetic flux, or current
   "the particles decayed during the nuclear fission process"
   - disintegrate, decompose
    
2. Fall into decay or ruin
   "The unoccupied house started to decay"
   - crumble, dilapidate
    
3. Undergo decay or decomposition
   "The body started to decay and needed to be cremated"

See also: decadent, unsound

Type of: change, change integrity

Encyclopedia: Decay Decay, radioactive