Word: headfirst
Part of speech: Adjective
Syllables: head
first
Definition: With the head in front; headlong.
Morphemes:
Affix: head
Language: en
PoS: Noun
Meaning: To do with heads.
Affix: fore
Language: en
PoS: Adjective
Meaning: Forward; situated towards the front (of something).
Affix: -est
Language: en
PoS: Suffix
Meaning: Used to form the superlative of adjectives and adverbs.