Open English Wordnet
Adjectives
(s)hasty, headlongexcessively quick“made a hasty exit”,
“a headlong rush to sell” (s)headfirst, headlongwith the head foremost“a headfirst plunge down the stairs”,
“a headlong dive into the pool” Adverbs
(r)headlong, headfirstwith the head before the body“the runner slid headlong into third base” (r)headlong, rashlyin a hasty and foolhardy manner“he fell headlong in love with his cousin”