Word: unbeknown
Part of speech: Adjective
Syllables: un
be
known
Definition: Not beknown.
Morphemes:
Affix: un-
Language: en
PoS: Prefix
Meaning: absent; lacking; not; negative
Affix: be-
Language: en
PoS: Prefix
Meaning: Forming verbs derived from nouns or adjectives, usually with the sense of "to make, become, or cause to be".
Affix: known
Language: en
PoS: Adjective
Meaning: Accepted, familiar, researched.