Standard Lemma guide

Know-Nothing

adj · noun · 3 senses · updated from the 2026-07-25 local source snapshot

Definitions and examples are grouped by meaning. Pronunciation, history, word forms, translations, descendants, synonyms, antonyms, derived terms, and related words appear whenever the source provides them.

Sound

Pronunciation

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1

adj

Meaning 1

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

Definition source: English Wiktionary via Wiktextract

Usage: not-comparable

No example sentence was provided for this meaning.

Meaning relationships

Synonyms: none provided

Antonyms: none provided

2

noun

Meaning 2

A member of a secret antiforeigner political organization in the nineteenth-century United States.

Definition source: English Wiktionary via Wiktextract

Usage: US, historical

Topics: government, politics

No example sentence was provided for this meaning.

Meaning relationships

Synonyms: none provided

Antonyms: none provided

3

noun

Meaning 3

An ignorant person; one who lacks knowledge.

Definition source: English Wiktionary via Wiktextract

No example sentence was provided for this meaning.

Meaning relationships

Synonyms: ignoramus

Antonyms: none provided

History

Etymology

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

Party members claimed to know nothing about the party when questioned.