Antonyms of noun improvement

1 of 3 senses of improvement

Sense 3
improvement, melioration -- (a condition superior to an earlier condition; "the new school represents a great improvement")
       Antonym of decline (Sense 2)
      => decline, declination -- (a condition inferior to an earlier condition; a gradual falling off from a better state)

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

3 senses of improvement

Sense 1
improvement, betterment, advance -- (a change for the better; progress in development)
       => transformation, transmutation, shift -- (a qualitative change)

Sense 2
improvement -- (the act of improving something; "their improvements increased the value of the property")
       => change of state -- (the act of changing something into something different in essential characteristics)

Sense 3
improvement, melioration -- (a condition superior to an earlier condition; "the new school represents a great improvement")
       => condition, status -- (a state at a particular time; "a condition (or state) of disrepair"; "the current status of the arms negotiations")