Available Definitions:
1) a. & adv. - With the head foremost; as, to fall headlong.
2) a. & adv. - Rashly; precipitately; without deliberation.
3) a. & adv. - Hastily; without delay or respite.
4) a. - Rash; precipitate; as, headlong folly.
5) a. - Steep; precipitous.