adj. 25B6; adverb
he fell headlong into the tent : HEAD FIRST, on one's head.
she rushed headlong to join the craze : WITHOUT THINKING, without forethought, precipitously, impetuously, rashly, recklessly, carelessly, heedlessly, hastily.
cautiously.
25B6; adjective a headlong dash : BREAKNECK, whirlwind; reckless, precipitate, precipitous, hasty, careless, heedless.
cautious.