英和和英

副詞

headfirst (not comparable)

1. With the head in front; headlong.

   Antonym: feet first

2. Rashly; precipitately; without deliberation; hastily.
   • 2016, Kerry Greenwood, Murder and Mendelssohn, Sydney: Allen and Unwin, page 245:

     Sheffield was not going to stop being Sheffield just because he had dived headfirst into the lusts of the flesh.

   • 2025 August 4, Sheera Frenkel, “The Militarization of Silicon Valley”, in The New York Times‎, New York, N.Y.: The New York Times Company, →ISSN, →OCLC, archived from the original on 5 August 2025:

     Over the past two years, Silicon Valley’s leaders and investors — many of whom had once forsworn involvement in weapons and war — have plunged headfirst into the military industrial complex.

同意語

• (with the head in front): headforemost, headlong

形容詞

headfirst (not comparable)

1. With the head in front; headlong.

発音

• (英国発音) IPA: /hɛd.fɜːst/
• (米国発音) IPA: /hɛd.fɝst/

副詞

head first (comparative more head first, superlative most head first)

1. With the head first or foremost.

   Synonym: headlong

   Antonyms: feet first, footling, footling breech

   • 1884 December 10, Mark Twain [pseudonym; Samuel Langhorne Clemens], chapter VII, in The Adventures of Huckleberry Finn: (Tom Sawyer’s Comrade) […], London: Chatto & Windus, […], →OCLC, page 48:

     I shot head first off of the bank like a frog, clothes and all on, and struck out for the canoe.

   • 1889, Lewis Carroll [pseudonym; Charles Lutwidge Dodgson], “L’Amie Inconnue”, in Sylvie and Bruno, London, New York, N.Y.: Macmillan and Co., →OCLC, page 25:

     He must be able to spring from the floor to about twice his own height, gradually turning over as he rises, so as to come down again head first.

参照

• The Oxford English Dictionary, Second edition, 1989; online version November 2010. Link. Earlier version first published in New English Dictionary, 1896.