This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

• Lexulous
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ad. With the head leading; headfirst: The runner slid headlong into third base.

ad. In an impetuous manner; rashly.

ad. 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.

ad. With the head first or down.

ad. With an unrestrained forward motion.

adj. Precipitous.

adj. Plunging downwards head foremost.

adj. Rushing forward without restraint.

adj. Reckless, impetuous.

v. To precipitate.

ad. With the head foremost; headforemost; head first.

ad. Rashly; precipitately; without deliberation.

ad. Hastily; without delay or respite.

adj. Rash; precipitate.

adj. Steep; precipitous.

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.

adj. with the head foremost

adj. excessively quick

ad. with the head foremost

ad. at breakneck speed

ad. in a hasty and foolhardy manner

"Wild-dog sprang back and whirled away in headlong flight for a score of yards before he learned that he was not pursued."

forward    hurried   

headlongness    headlongs   

headforemost    rashly    precipitately    hastily    rash    precipitate    steep    precipitous    headfirst    pell-mell