Standard Lemma guide

headfirst

adj · adv · 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.

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Pronunciation

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  • CMU ARPABET: HH EH1 D F ER1 S T Digits mark lexical stress: 1 primary, 2 secondary, 0 unstressed.

1

adj

Meaning 1

With the head in front; headlong.

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

adv

Meaning 2

With the head in front; headlong.

Definition source: English Wiktionary via Wiktextract

Usage: not-comparable

No example sentence was provided for this meaning.

Meaning relationships

Synonyms: none provided

Antonyms: feet first

3

adv

Meaning 3

Rashly; precipitately; without deliberation; hastily.

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

4

adjective satellite

Meaning 4

with the head foremost

Definition source: Princeton WordNet 3.0

Examples

  • a headfirst plunge down the stairs
  • a headlong dive into the pool

Meaning relationships

Synonyms: headlong

Antonyms: none provided

5

adverb

Meaning 5

with the head foremost

Definition source: Princeton WordNet 3.0

Examples

  • the runner slid headlong into third base

Meaning relationships

Synonyms: headlong

Antonyms: none provided

History

Etymology

From head + first.

Real reading context

headfirst in complete knowledge articles