headfirst — English Dictionary

Adverb

1. With the head in front; headlong.

   Usage

   • not-comparable

   Antonyms

   feet first

2. Rashly; precipitately; without deliberation; hastily.

   Usage

   • not-comparable

   Examples

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

   More examples (1)

   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.

Adjective

1. With the head in front; headlong.

   Usage

   • not-comparable

Adjective

1. with the head foremost

   Synonyms

   headlong

   Examples

   a headfirst plunge down the stairs

   a headlong dive into the pool

Adverb

1. with the head before the body

   Synonyms

   headlong

   Examples

   the runner slid headlong into third base