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.

a corps perdu abrupt abruptly accident-prone agile bluff bold breakneck breathless careless carelessly daredevil daring dashing desperate desperately devil-may-care double-quick eagle-winged electrifying expeditious express fast fleet flying foolhardy furious furiously galloping hair-trigger happen what may harum-scarum hastily hasty head over heels headfirst headforemost heedlessly heels over head helter-skelter holus-bolus hotheaded hotheadedly hurried hurriedly hurry-scurry hustling impatient impetuous impetuously impulsive impulsively light of heel light-footed like crazy like mad lively mad madly mercurial nerve-shattering nimble nimble-footed overeager overeagerly overenthusiastic overenthusiastically overhasty overzealous overzealously panting plunging precipitant precipitantly precipitate precipitately precipitous precipitously prompt quick quick as lightning quick as thought quickly ramble-scramble rapid rash rashly reckless recklessly running rushing sharp sheer shocking slam-bang slap-bang slapdash snappy spanking speedy startling steep sudden suddenly surprising swift unanticipated unexpected unforeseen unlooked-for unpredicted vertical wanton wantonly wild wildly winged