Excessively quick:
— A headlong rush to sell.

synoniem: hasty.

Roget 684: hasty, hurried, brusque; scrambling, cursory, precipitate, headlong, furious, boisterous, impetuous, hotheaded; feverish, fussy; pushing.    in haste, in a hurry etc. n.; in hot haste, in all haste; breathless, pressed for time, hard pressed, urgent.    ... meer laten zien

Roget 863: rash, incautious, indiscreet; imprudent, improvident, temerarious; uncalculating^†; heedless; careless etc. (neglectful) 460; without ballast, heels over head, head over heels; giddy etc. (inattentive) 458; wanton, reckless, wild, madcap; desperate, devil-may-care.    hot-blooded, hotheaded, hotbrained^†; headlong, headstrong; breakneck; foolhardy; harebrained; precipitate, impulsive.    overconfident, overweening; venturesome, venturous; adventurous, Quixotic, fire eating, cavalier; janty^†, jaunty, free and easy.    off one's guard etc. (inexpectant) 508^†.    ... meer laten zien

Pools: pośpieszny, spieszny, śpieszny, pospieszny

With the head foremost:
— A headlong dive into the pool.

synoniem: headfirst.

With the head foremost:
— The runner slid headlong into third base.

synoniem: headfirst.

Roget 173: violently etc. adj.; amain^†; by storm, by force, by main force; with might and main; tooth and nail, vi et armis [Lat.], at the point of the sword, at the point of the bayonet; at one fell swoop; with a high hand, through thick and thin; in desperation, with a vengeance; a outrance^†, a toute outrance [Fr.]; headlong, head foremost.    ... meer laten zien

At breakneck speed:
— Burst headlong through the gate.

synoniem: precipitately.

Roget 684: with haste, with all haste, with breathless speed; in haste etc. adj.; apace etc. (swiftly) 274; amain^†; all at once etc. (instantaneously) 113; at short notice &c.; immediately etc. (early) 132; posthaste; by cable, by express, by telegraph, by forced marches.    hastily, precipitately etc. adj.; helter-skelter, hurry-skurry^†, holus-bolus; slapdash, slap-bang; full-tilt, full drive; heels over head, head and shoulders, headlong, a corps perdu [Fr.].    by fits and starts, by spurts; hop skip and jump.    ... meer laten zien

In a hasty and foolhardy manner:
— He fell headlong in love with his cousin.

synoniem: rashly.