Headlong
Part of speech: adverb
Definition: With the head first or down. With an unrestrained forward motion.
Part of speech: adjective
Definition: Precipitous. Plunging downwards head foremost. Rushing forward without restraint. Reckless, impetuous.
Headfirst
Part of speech: adverb
Definition: With the head in front; headlong
Part of speech: adjective
Definition: With the head in front; headlong