invalid

1. 1.

   having no cogency or legal force

   “invalid reasoning”

   “an invalid driver's license”

   Antonymsvalid

   Similarbadfallaciousfalsespuriousinvalidatednullsophistic
2. 2.

   no longer valid

   “the license is invalid”

   Similarexpired

1. 1.

   someone who is incapacitated by a chronic illness or injury

   Synonymsshut-in

   Broadersick person

   Part ofhomebound

Other forms of invalid

plural

invalids·

past tense

invalidded·

present participle

invalidding·

Forms marked · are formed by the regular rule rather than recorded in the source data. English keeps a few hundred irregulars and the rest follow the pattern, so the rule is right far more often than not — but it is a rule, and the mark says so.

Questions about invalid

What does invalid mean?

invalid means "force to retire, remove from active duty, as of firemen". That is the primary sense; the word has 5 in total, listed in full on this page.

How many syllables are in invalid?

invalid has 3 syllables: in-va-lid. The stress falls on "in". In IPA it is /ˈɪnvələd/.

What is another word for invalid?

Close synonyms include disable, incapacitate, handicap, shut-in. Each sense on this page lists its own synonyms, because a word with several meanings rarely has one substitute that works for all of them.

What is the opposite of invalid?

The recorded antonyms are valid.

Is invalid a common word?

invalid is banded "Familiar" — widely understood, used when the subject calls for it. The band comes from how often the word appears in a large corpus of everyday English, not from an editor's impression.