There are 10 12-letter words that start with 'unb'.
| unbarricaded | unbecomingly | unbelievable |
| unbelievably | unbiasedness | unblinkingly |
| unblushingly | unbreachable | unbreathable |
| unbridgeable | ||
Note: These 10 12-letter words that start with 'unb' are found from the USA & Canada version of the tournament Scrabble word list.
Also see words start with unbe, unbo, unbr, unbu, unba, unbl, unbi.
4-letter words start with 'unb' (1)