adv. [ OE. hedling, hevedlynge; prob. confused with E. long, a. & adv. ] [ 1913 Webster ]
1. With the head foremost; headforemost; head first; as, to fall headlong. Acts i. 18. [ 1913 Webster ]
2. Rashly; precipitately; without deliberation. [ 1913 Webster ]
3. Hastily; without delay or respite. [ 1913 Webster ]
a. 1. Rash; precipitate; as, headlong folly. [ 1913 Webster ]
2. Steep; precipitous. [ Poetic ] [ 1913 Webster ]
Like a tower upon a headlong rock. Byron. [ 1913 Webster ]