Definitions

headlong

[hed-lawng, -long] / ˈhɛdˌlɔŋ, -ˌlɒŋ /

ADJECTIVE

dangerous, reckless

Synonyms

STRONGEST

breakneck hurried sudden

WEAK

abrupt brash daredevil daring foolhardy hasty impetuous impulsive inconsiderate precipitant precipitate rash rough rushing tempestuous thoughtless

Antonyms

STRONGEST

slow

WEAK

careful cautious thoughtfully wary

Example Sentences

Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.

But the race to deploy AI agents is running headlong into a scramble for the chips and energy needed to power them.

From Barron's • May 6, 2026

But that’s not stopping the companies developing quantum hardware and software from speeding headlong into the public markets.

From The Wall Street Journal • Apr. 27, 2026

“It looks like they’re running headlong into a brick wall,” Valatsas said.

From The Wall Street Journal • Jan. 21, 2026

It’s fun, headlong reading with a shot of melancholy.

From Los Angeles Times • Jan. 20, 2026

He says I’m like a baby who runs headlong into things, not knowing enough to be afraid.

From "Everything, Everything" by Nicola Yoon

Vocabulary lists containing headlong

The Vocabulary.com Top 1000

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List 5

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The Odyssey

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