from The American Heritage® Dictionary of the English Language, 4th Edition
- adv. With the head leading; headfirst: The runner slid headlong into third base.
- adv. In an impetuous manner; rashly.
- adv. At breakneck speed or with uncontrolled force.
- adj. Done with the head leading; headfirst: a headlong dive.
- adj. Impetuous; rash. See Synonyms at impetuous.
- adj. Uncontrollably forceful or fast.
- adj. Archaic Steep; sheer.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- adv. With the head first or down.
- adv. With an unrestrained forward motion.
- adj. Precipitous.
- adj. Plunging downwards head foremost.
- adj. Rushing forward without restraint.
- adj. Reckless, impetuous.
- v. To precipitate.
from the GNU version of the Collaborative International Dictionary of English
- adv. With the head foremost; headforemost; head first.
- adv. Rashly; precipitately; without deliberation.
- adv. Hastily; without delay or respite.
- adj. Rash; precipitate.
- adj. Steep; precipitous.
from The Century Dictionary and Cyclopedia
- With the head foremost: as, to fall headlong.
- Rashly; precipitately; without deliberation.
- Hastily; without delay or respite; tumultuously.
- Steep; precipitous.
- Rash; precipitate: as, headlong folly.
- Rushing precipitately; precipitate; hasty.
- To precipitate.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- adj. with the head foremost
- adj. excessively quick
- adv. with the head foremost
- adv. at breakneck speed
- adv. in a hasty and foolhardy manner
From Middle English (bi) hedlong, alteration of (bi) hedling : hed, head; see head + -ling, in a specified direction; see -ling2.(American Heritage® Dictionary of the English Language, Fourth Edition)
From Middle English hedlong, alteration of hedling, heedling, hevedlynge ("headlong"), assimilated to long. More at headling. (Wiktionary)