undeteriorative

• a word derived from deteriorate.
  deteriorate

  verb (used with or without object)

  to make or become worse or inferior in condition, character, quality, value, etc.

Related Words

• crumble
• decline
• degrade
• depreciate
• disintegrate
• ebb
• fade
• fail
• fall apart
• languish
• lessen
• lower
• regress
• sink
• slide
• undermine
• weaken
• worsen