head·​first | \ ˈhed-ˈfərst \

Definition of headfirst

1 : with the head foremost dove headfirst into the waves

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Other Words from headfirst

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

Bold and ambitious, Aries dives headfirst into even the most challenging situations. Aliza Kelly Faragher, Allure, "Each Zodiac Sign's Unique Personality Traits, Explained by an Astrologer," 28 Oct. 2018 The success of the event piqued the company’s interest — but not enough to dive headfirst into launching a brand-new League of Legends or Overwatch team. Andrew Webster, The Verge, "Why competitive gaming is starting to look a lot like professional sports," 27 July 2018 Baez slid headfirst across the plate, well ahead of Adrian Gonzalez’s throw. Tyler Kepner, New York Times, "These Are Not the Mets Mickey Callaway Is Looking For," 3 June 2018 Motivated not by greed or self interest, Swildens stepped headfirst into one of the hottest Silicon Valley fights of the last decade, Waymo v. Uber, and won. David Grossman, Popular Mechanics, "A Solo Engineer Challenged a Waymo Self-Driving Patent—And Won," 3 Oct. 2018 The industrialized nations of the world, hurtling headfirst into world war, began rationing steel for a select few purposes: ships, tanks, guns, and planes. Jonathan Schifman, Popular Mechanics, "The Entire History of Steel," 9 July 2018 Odubel Herrera slid headfirst into third base, helmet covering his eyes, and slapped the bag with his right hand. Scott Lauber, Philly.com, "Odubel Herrera leads Phillies to win over Pirates," 20 Apr. 2018 What makes his accomplishment even more amazing is that less than four years ago, Plain was nearly paralyzed while body surfing when a wave threw him headfirst into the sand and fractured several of his vertebrae. Steve Gardner, USA TODAY, "Reaching Mount Everest's peak, Australian sets '7 Summits' speed-climbing record," 16 May 2018 Less than a year after the death of her husband, René Angélil, Celine Dion is jumping headfirst into the music world once again. Megan Friedman, Good Housekeeping, "Pink Wrote a Brand-New Song for Celine Dion After René's Death," 8 July 2016

These example sentences are selected automatically from various online news sources to reflect current usage of the word 'headfirst.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.

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First Known Use of headfirst

1790, in the meaning defined at sense 1

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Statistics for headfirst

Last Updated

7 Jan 2019

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Time Traveler for headfirst

The first known use of headfirst was in 1790

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More Definitions for headfirst



English Language Learners Definition of headfirst

: with the head leading

: without taking time to think about your actions


head·​first | \ ˈhed-ˈfərst \

Kids Definition of headfirst

: with the head in front He fell headfirst down the stairs.

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More from Merriam-Webster on headfirst

Rhyming Dictionary: Words that rhyme with headfirst

Spanish Central: Translation of headfirst

Nglish: Translation of headfirst for Spanish Speakers

Comments on headfirst

What made you want to look up headfirst? Please tell us where you read or heard it (including the quote, if possible).


a complex dispute or argument

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