Synonyms/Hypernyms (Ordered by Estimated Frequency) of noun deterioration

2 senses of deterioration

Sense 1
deterioration, impairment -- (a symptom of reduced quality or strength)
       => decay -- (an inferior state resulting from the process of decaying; "the corpse was in an advanced state of decay"; "the house had fallen into a serious state of decay and disrepair")

Sense 2
deterioration, decline in quality, declension, worsening -- (process of changing to an inferior state)
       => decline, diminution -- (change toward something smaller or lower)