Synonyms/Hypernyms (Ordered by Estimated Frequency) of verb decay

3 senses of decay

Sense 1
disintegrate, decay, decompose -- (lose a stored charge, magnetic flux, or current; "the particles disintegrated during the nuclear fission process")
       => change integrity -- (change in physical make-up)

Sense 2
decay, crumble, dilapidate -- (fall into decay or ruin; "The unoccupied house started to decay")
       => change -- (undergo a change; become different in essence; losing one's or its original nature; "She changed completely as she grew older"; "The weather changed last night")

Sense 3
decay -- (undergo decay or decomposition; "The body started to decay and needed to be cremated")
       => change -- (undergo a change; become different in essence; losing one's or its original nature; "She changed completely as she grew older"; "The weather changed last night")

Antonyms of adj decayed

1 sense of decayed

Sense 1
decayed, rotten, rotted -- (damaged by decay; hence unsound and useless; "rotten floor boards"; "rotted beams"; "a decayed foundation")

INDIRECT (VIA unsound) -> sound -- (in good condition; free from defect or damage or decay; "a sound timber"; "the wall is sound"; "a sound foundation")

Similarity of adj decayed

1 sense of decayed

Sense 1
decayed, rotten, rotted -- (damaged by decay; hence unsound and useless; "rotten floor boards"; "rotted beams"; "a decayed foundation")
       => unsound (vs. sound) -- (not in good condition; damaged or decayed; "an unsound foundation")