head·​first | \ ˈhed-ˈfərst How to pronounce headfirst (audio) \

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

What better way to jump headfirst into the season than with a new spring dress (or two)? Glamour, "The 18 Best Spring Dresses Under $200," 21 Mar. 2019 After penning a sweet love letter to fans about the emotions leading up to the tour, Ari dove headfirst into rehearsals and prep for the worldwide event, which begins on March 18 in Albany, NY. De Elizabeth, Teen Vogue, "Ariana Grande Shares Behind the Scenes Pictures from the "Sweetener" World Tour," 9 Mar. 2019 But as is so often the case with societal shifts, artists are leaping headfirst into the epistemological fray. James Vincent, The Verge, "What algorithmic art can teach us about artificial intelligence," 6 Nov. 2018 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

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

15 Apr 2019

Look-up Popularity

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 How to pronounce headfirst (audio) \

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).


an enemy or opponent

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