invalid - Dictionary Definition : Vocabulary.com

A person who is very sick or injured and needs frequent care is an invalid. Also, something no longer current or useful is invalid.

The main uses of this word have to do with people and things that don't work very well anymore. A driver's license that has expired is invalid — it needs to be renewed. If you lost your health insurance, it's invalid. People who are called invalids are disabled or incapacitated severely. Be careful with this word, because some think it is inappropriate, since it sounds as if some people are not as valid as others based on physical capability.

PRIMARY MEANINGS OF: invalid

1	n v	someone who is incapacitated by a chronic illness or injury injure permanently
2	adj	no longer valid
3	v	force to retire, remove from active duty, as of firemen

FULL DEFINITIONS OF: invalid

1

n someone who is incapacitated by a chronic illness or injury

Synonyms:: shut-in

Type of:: diseased person, sick person, sufferer
a person suffering from an illness

v injure permanently

Synonyms:: disable, handicap, incapacitate

Types:: hock
disable by cutting the hock

Type of:: injure, wound
cause injuries or bodily harm to

2

adj no longer valid

“the license is invalid”

Synonyms: expired
having come to an end or become void after passage of a period of time

adj having no cogency or legal force

“invalid reasoning”

“an invalid driver's license”

Synonyms: illegitimate
of marriages and offspring; not recognized as lawful; bad, uncollectible
not capable of being collected; fallacious, unsound
containing or based on a fallacy; false
erroneous and usually accidental; invalidated, nullified
deprived of legal force; null, void
lacking any legal or binding force; sophistic, sophistical
plausible but misleading

Antonyms:: valid
well grounded in logic or truth or having legal force; legitimate
of marriages and offspring; recognized as lawful; reasonable, sensible
showing reason or sound judgment; binding
executed with proper legal authority; effectual, legal, sound
having legal efficacy or force; legitimate, logical
based on known statements or events or conditions; reasoned, sound, well-grounded
logically valid; validated
declared or made legally valid; show more antonyms...

3

v force to retire, remove from active duty, as of firemen

Type of:: remove
remove from a position or an office