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Definition of headlong : 1. Hastily; without delay or respite.
2. Rash; precipitate; as, headlong folly.
3. Rashly; precipitately; without deliberation.
4. Steep; precipitous.
5. With the head foremost; as, to fall headlong.

Synonyms:

precipitately, impulsive, hotheaded, brash, overhasty, ill-considered, foolhardy, rashly, hasty, forward, slapdash, madcap, improvident, unconsidered, precipitate, headfirst, careful, hurried, incautious, temerarious, reckless, precipitous, precipitant, harum-scarum

reckless (part of speech: adjective)

impetuous, rash

Usage examples: