Word: unbegun
Part of speech: Adjective
Syllables: un
be
gun
Definition: That had no beginning; always existent.
Morphemes:
Affix: un-
Language: en
PoS: Prefix
Meaning: absent; lacking; not; negative
Affix: begun
Language: en
PoS: Verb
Meaning: Alternative form of begin; begin to speak or say;  he began