Standard Lemma guide

knuckleball

noun · verb · 5 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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No pronunciation record was provided for this word.

1

noun

Meaning 1

A pitch thrown with the ball gripped on the fingertips and released with no rotation, which travels over an unpredictable path to the plate due to micro-turbulence in the air.

Definition source: English Wiktionary via Wiktextract

Topics: ball-games, baseball, games, hobbies, lifestyle, sports

Examples

  • Even the pitcher doesn't know where his knuckleball is going.
  • Boston Red Sox pitcher Tim Wakefield is best known for his use of the knuckleball.

Meaning relationships

Synonyms: none provided

Antonyms: none provided

2

noun

Meaning 2

A type of delivery where a fast bowler holds the ball on the knuckles of the index and middle fingers.

Definition source: English Wiktionary via Wiktextract

Topics: ball-games, cricket, games, hobbies, lifestyle, sports

No example sentence was provided for this meaning.

Meaning relationships

Synonyms: none provided

Antonyms: none provided

3

noun

Meaning 3

An event that is hard to predict.

Definition source: English Wiktionary via Wiktextract

Usage: figuratively, informal

Examples

  • Our vendor keeps throwing us knuckleballs.

Meaning relationships

Synonyms: none provided

Antonyms: none provided

4

verb

Meaning 4

To pitch knuckleballs.

Definition source: English Wiktionary via Wiktextract

Usage: intransitive

Topics: ball-games, baseball, games, hobbies, lifestyle, sports

No example sentence was provided for this meaning.

Meaning relationships

Synonyms: none provided

Antonyms: none provided

5

noun

Meaning 5

a baseball pitch thrown with little speed or spin

Definition source: Princeton WordNet 3.0

No example sentence was provided for this meaning.

Meaning relationships

Synonyms: knuckler

Antonyms: none provided

Broader terms: pitch, delivery

History

Etymology

From knuckle + ball.

Across languages

Translations

5 source translations are retained for this English entry.

  • Catalan: llançament de nus — A pitch thrown with the ball gripped on the fingertips and released with no rotation
  • French: balle-papillon — A pitch thrown with the ball gripped on the fingertips and released with no rotation
  • Japanese: ナックル (nakkuru) — A pitch thrown with the ball gripped on the fingertips and released with no rotation
  • Korean: 너클볼 (neokeulbol) — A pitch thrown with the ball gripped on the fingertips and released with no rotation
  • Spanish: lanzamiento de nudillos — A pitch thrown with the ball gripped on the fingertips and released with no rotation
Real reading context

knuckleball in complete knowledge articles