In an invalid manner; without validity.

What type of word is invalid?

The word invalid is a noun derived from the Latin word invalidus, which means weak. ... The word invalid is an adjective that is also derived from the Latin word invalidus, in the sense of being weak or feeble.

Is invalid a noun or adjective?

Word forms: invalidspronunciation note: The noun is pronounced (ɪnvəlɪd ). The adjective is pronounced (ɪnvælɪd ) and is hyphenated in|val|id. An invalid is someone who needs to be cared for because they have an illness or disability.