"headlong" in the adjective sense
1. hasty, headlong
excessively quick
"made a hasty exit"
"a headlong rush to sell"
2. headfirst, headlong
with the head foremost
"a headfirst plunge down the stairs"
"a headlong dive into the pool"
"headlong" in the adverb sense
1. headlong, headfirst
with the head foremost
"the runner slid headlong into third base"
2. headlong, precipitately
at breakneck speed
"burst headlong through the gate"
3. headlong, rashly
in a hasty and foolhardy manner
"he fell headlong in love with his cousin"
Source: WordNet® (An amazing lexical database of English)
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