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know-nothing

The English word “know-nothing” has 2 meanings listed here.

adjective

  1. Ignorant; characterized by foolish denial of facts or beliefs in that which is not true.

noun

  1. An ignorant person; one who lacks knowledge.

Etymology

Essentially deverbal in nature, albeit not from a unitary phrasal verb. Compare do-nothing § Etymology.

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Definitions are from Wiktionary, extracted by Kaikki.org, and are available under the CC BY-SA 4.0 licence.