To add to above, Harper's Dictionary of Contemporary Usage says bodacious is a dialect term popularized in America in the "Barney Google and Snuffy Smith" comic strip. It means bold, audacious, daring, and arrogant. It may well be a blend of "bold" and "audacious" and originally appeared in British slang centuries ago as boldacious. However, the Supplement to the Oxford English Dictionary credits the present version as an Americanism.