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HYPHEN
COUNT IN NET
WORDNET DICTIONARY
CIDE DICTIONARY
THESAURUS

WORDNET DICTIONARY

Adjective headfirst has 1 sense

• headfirst(s = adj.all) headlong - with the head foremost; "a headfirst plunge down the stairs"; "a headlong dive into the pool"

Adverbial headfirst has 1 sense

• headfirst(r = adv.all) headlong - with the head foremost; "the runner slid headlong into third base"

CIDE DICTIONARY

THESAURUS

headfirst

a corps perdu, abruptly, carelessly, desperately, furiously, happen what may, hastily, head over heels, headforemost, headlong, heedlessly, heels over head, helter-skelter, holus-bolus, hotheadedly, hurriedly, hurry-scurry, impetuously, impulsively, like crazy, like mad, madly, overeagerly, overenthusiastically, overzealously, precipitantly, precipitately, precipitously, ramble-scramble, rashly, recklessly, slam-bang, slap-bang, slapdash, suddenly, wantonly, wildly

For further exploring for "headfirst" in Webster Dictionary Online