noun which may take the genitive case particle 'no'
Used as a no-adjective to describe something not yet verified or identified. Common in compounds like 未確認情報 (unconfirmed information) and 未確認飛行物体 (unidentified flying object).
That information is still unconfirmed.
An unidentified creature was sighted.
Compound of 未 (mi, 'not yet') + 確認 (kakunin, 'confirmation'). The kanji 未 indicates something not yet done, and 確認 means to confirm or verify.