Usually means: Reduce ability or function significantly.
Definitions Related words Phrases (New!) Mentions Lyrics History Colors (New!)
We found 33 dictionaries that define the word impair:

General (26 matching dictionaries)
  1. impair: Merriam-Webster.com
  2. impair: Oxford Learner's Dictionaries
  3. impair: American Heritage Dictionary of the English Language
  4. impair: Collins English Dictionary
  5. impair: Vocabulary.com
  6. Impair, impair: Wordnik
  7. impair: Cambridge Advanced Learner's Dictionary
  8. impair: Wiktionary
  9. impair: Webster's New World College Dictionary, 4th Ed.
  10. impair: The Wordsmyth English Dictionary-Thesaurus
  11. impair: Infoplease Dictionary
  12. impair: Dictionary.com
  13. impair: Online Etymology Dictionary
  14. impair: Cambridge Essential American English Dictionary
  15. Impair: Wikipedia, the Free Encyclopedia
  16. Impair: Online Plain Text English Dictionary
  17. impair: Webster's Revised Unabridged, 1913 Edition
  18. impair: Rhymezone
  19. impair, impair(e): AllWords.com Multi-Lingual Dictionary
  20. impair: Webster's 1828 Dictionary
  21. impair: Free Dictionary
  22. impair: Mnemonic Dictionary
  23. impair: LookWAYup Translating Dictionary/Thesaurus
  24. impair: Dictionary/thesaurus

Business (4 matching dictionaries)
  1. impair: Webster's New World Law Dictionary
  2. Glossary of Legal Terms (No longer online)
  3. impair: Legal dictionary
  4. impair: Financial dictionary

Computing (1 matching dictionary)
  1. impair: Encyclopedia

Medicine (1 matching dictionary)
  1. impair: Medical dictionary

Miscellaneous (1 matching dictionary)
  1. impair: Idioms

(Note: See impaired as well.)

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Definitions from Wiktionary (
)
American English Definition British English Definition
▸ verb:  (transitive) To weaken; to affect negatively; to have a diminishing effect on.
▸ verb:  (intransitive, archaic) To grow worse; to deteriorate.
▸ adjective:  (obsolete) Not fit or appropriate; unsuitable.
▸ noun:  (obsolete) The act of impairing or deteriorating.
▸ noun:  (obsolete) The fact of being impaired or having grown worse.
▸ noun:  (obsolete) An impairment or deterioration.

Similar:
vitiate, mar, deflower, spoil, empair, empayre, deteriorate, pair, impinge, impoverish, more...

Opposite:
improve, enhance, upgrade

Types:
hearing, vision, mobility, speech, memory, cognition, reasoning, attention, executive function, more...

Phrases:
impair function, more...

Adjectives:
least, cognitive, most, other, visual, wise, common, renal, severe, functional, significant

Colors:
    gray,     pale pink,     smoky black,     rusty red


▸ Word origin

▸ Words similar to impair

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▸ Idioms related to impair

▸ Wikipedia articles (New!)

▸ Popular adjectives describing impair

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▸ Rhymes of impair

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Similar:
vitiate, mar, deflower, spoil, empair, empayre, deteriorate, pair, impinge, impoverish, more...

Opposite:
improve, enhance, upgrade

Types:
hearing, vision, mobility, speech, memory, cognition, reasoning, attention, executive function, more...

Phrases:
impair function, more...

Adjectives:
least, cognitive, most, other, visual, wise, common, renal, severe, functional, significant

Colors:
    gray,     pale pink,     smoky black,     rusty red



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