headlong

adjectives

excessively quick
"made a hasty exit"; "a headlong rush to sell"
hasty, headlong
with the head foremost
"a headfirst plunge down the stairs"; "a headlong dive into the pool"
headfirst, headlong

adverbs

with the head foremost
"the runner slid headlong into third base"
headfirst, headlong
at breakneck speed
"burst headlong through the gate"
headlong, precipitately
in a hasty and foolhardy manner
"he fell headlong in love with his cousin"
headlong, rashly