1. [adj]  unrestrained by convention or propriety; "an audacious trick to pull"; "a barefaced hypocrite"; "the most bodacious display of tourism this side of Anaheim"- Los Angeles Times; "bold-faced lies"; "brazen arrogance"; "the modern world with its quick material successes and insolent belief in the boundless possibilities of progress"- Bertrand Russell
2. [adj]  (regional informal) incorrigible; "a bodacious gossip"

BODACIOUS is a 9 letter word that starts with B.