headfirst

[ hed-furst ]

/ ˈhɛdˈfɜrst /

with the head in front or bent forward; headforemost: He dived headfirst into the sea.

rashly; precipitately.

Origin of headfirst

First recorded in 1820–30; head + first

And I ran straight at him at full speed and then threw myself into a headfirst slide.

Mel Brooks Is Always Funny and Often Wise in This 1975 Playboy Interview |Alex Belth |February 16, 2014 |DAILY BEAST
Serpents strive to turn their prey and swallow it headfirst.

Zoology: The Science of Animal Life |Ernest Ingersoll
This unexpected monster was on our starboard bow, and the order to avoid the shoal was putting us headfirst into it.

A Labrador Doctor |Wilfred Thomason Grenfell
Rick waited until the vinta was on the downward slope of the backwash from the shore, then went in headfirst.

The Pirates of Shan |Harold Leland Goodwin

You know, headfirst into the water, from a great height, the problem is to enter the water at the perfect angle.

The Night-Born |Jack London
Would O'Shea make him drunk, and then cast him headfirst into the swallowing sand?

The Mermaid |Lily Dougall

headfirst

/ (ˈhɛdˈfɜːst) /

with the head foremost; headlong he fell headfirst

rashly or carelessly