Decay adjectives are listed in this post. Each word below can often be found in front of the noun decay in the same sentence. This reference page can help answer the question what are some adjectives commonly used for describing DECAY.
actual, apparent, autumnal, beta, calm, certain, cold, complete, consequent, constant, continual, cultural, daily, dark, deep, dental, dull
early, economic, environmental, exponential, extensive, fast, final, first, foul, further, general, gentle, gradual, great, hopeless, human, incipient
incurable, industrial, inevitable, inner, institutional, intellectual, internal, inward, lamentable, last, lingering, little, long, mental, mere, mild, moral
more, mortal, much, national, natural, nuclear, old, only, organic, own, pale, partial, perpetual, phonetic, physical, picturesque, political
premature, present, progressive, quick, radioactive, rapid, religious, ruinous, sad, same, senile, sensible, serious, slow, social, speedy, spiritual
spontaneous, steady, subsequent, such, sudden, sure, swift, total, ultimate, universal, unperceived, urban, utter, visible
Hope this word list had the adjective used with decay you were looking for. Additional describing words / adjectives that describe / adjectives of various nouns can be found in the other pages on this website.