WordofTheDay.US

Added 8 October 2026

invalid

/ɪnˈvæl.ɪd/ noun

Categories: PeopleUncommon Words

In Latin: irritus Wiktionary

noun Definition from WordNet 3.1, Princeton University. Pronunciation from Wiktionary, via Kaikki.org. More about invalid at Wordnik → Where our words come from →

  1. Someone who is incapacitated by a chronic illness or injury.

verb

  1. Force to retire, remove from active duty, as of firemen.
  2. Injure permanently.
    He was disabled in a car accident

adjective

  1. Having no cogency or legal force.
    invalid reasoning
  2. No longer valid.
    the license is invalid

Origin

Borrowed from Middle French invalide, from Latin invalidus (“infirm, weak”), from in- (“not”) + validus (“strong”).

From Wiktionary, via Kaikki.org (CC BY-SA)

Related Words: invalidatedunsoundfalsenullvoidbaduncollectiblenullifiedexpirednugatoryincapacitatedisable

Back to today's word