1. invalid

noun. (ˈɪnvələd, ˈɪnvəlɪd, ˌɪnˈvæləd) Someone who is incapacitated by a chronic illness or injury.
Synonyms
sufferer homebound diseased person shut-in sick person
Antonyms
wholesome sound fit sane reliable
Etymology
invalid (English)
invalidus (Latin)
in- (Latin)
validus (Latin)
-idus (Latin)
valeo (Latin)
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2. invalid

adjective. (ˈɪnvələd, ˈɪnvəlɪd, ˌɪnˈvæləd) Having no cogency or legal force.
Synonyms
unsound bad invalidated null false uncollectible sophistical void fallacious nullified illegitimate sophistic
Antonyms
valid legitimate unbroken healthy undamaged
Etymology
invalid (English)
invalidus (Latin)
in- (Latin)
validus (Latin)
-idus (Latin)
valeo (Latin)

3. invalid

verb. (ˈɪnvələd, ˈɪnvəlɪd, ˌɪnˈvæləd) Force to retire, remove from active duty, as of firemen.
Synonyms
remove
Antonyms
obedient advisability
Etymology
invalid (English)
invalidus (Latin)
in- (Latin)
validus (Latin)
-idus (Latin)
valeo (Latin)

4. invalid

adjective. (ˈɪnvələd, ˈɪnvəlɪd, ˌɪnˈvæləd) No longer valid.
Synonyms
expired
Antonyms
unexpired uninjured
Etymology
invalid (English)
invalidus (Latin)
in- (Latin)
validus (Latin)
-idus (Latin)
valeo (Latin)

5. invalid

verb. (ˈɪnvələd, ˈɪnvəlɪd, ˌɪnˈvæləd) Injure permanently.
Synonyms
injure hock wound incapacitate handicap disable
Antonyms
dependable best better good favorable
Etymology
invalid (English)
invalidus (Latin)
in- (Latin)
validus (Latin)
-idus (Latin)
valeo (Latin)
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