headfirst

adverb

head·​first ˈhed-ˈfərst How to pronounce headfirst (audio)
Synonyms of headfirstnext
1
: with the head foremost
dove headfirst into the waves
2
headfirst adjective

Examples of headfirst in a Sentence

She dove into the water headfirst. She rushed into the relationship headfirst.
Recent Examples on the Web
Examples are automatically compiled from online sources to show current usage. Read More Opinions expressed in the examples do not represent those of Merriam-Webster or its editors. Send us feedback.
Industry sources have previously told CNN that American oil executives are unlikely to dive headfirst into Venezuela for multiple reasons, including security and uncertainty over the country’s political and economic situation. Michael Rios, CNN Money, 23 Jan. 2026 Over the course of 100 days, the actor throws himself headfirst into extreme challenges, from skiing to the South Pole to diving beneath the ice at the North Pole. Stephanie Giang-Paunon, FOXNews.com, 22 Jan. 2026 The 12-hour time difference didn’t stop him from diving headfirst into the moment, jumping on the bed, playfully unfurling the pieces and directing camera cuts. Rhonda Richford, Footwear News, 21 Jan. 2026 Collins went to the ground headfirst and, after being helped to the sideline and evaluated in the medical tent, was eventually carted to the locker room. Saad Yousuf, New York Times, 16 Jan. 2026 See All Example Sentences for headfirst

Word History

First Known Use

1790, in the meaning defined at sense 1

Time Traveler
The first known use of headfirst was in 1790

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Cite this Entry

“Headfirst.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/headfirst. Accessed 14 Feb. 2026.

Kids Definition

headfirst

adverb
head·​first ˈhed-ˈfərst How to pronounce headfirst (audio)
: with the head foremost
headfirst adjective

More from Merriam-Webster on headfirst

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