Synonyms of decaying in English:

decaying


See definition of decay

adjective

1‘the decaying bodies of fish filled the pond’

SYNONYMS
decomposing, decomposed, rotting, rotten, putrescent, putrid, bad, off, spoiled, spoilt, perished
mouldy, mouldering, festering, fetid, stinking, smelly, rancid, rank
maggoty, worm-eaten, wormy, flyblown

2‘Liverpool was a visibly decaying city’

SYNONYMS
declining, degenerating, dying, waning, crumbling, collapsing
run down, broken-down, tumbledown, ramshackle, shabby, battered, decrepit
in decline, on the decline, in ruins, in disrepair, in a state of disrepair, falling apart, falling to pieces
informal on its last legs, on the way out