Bold

1. Courageous, daring.
2. Visually striking; conspicuous.

3. (typography, of typefaces) Having thicker strokes than the ordinary form of the typeface.
4. Presumptuous, forward or impudent.
5. (Ireland) Naughty; insolent; badly-behaved.
6. Full-bodied.
7. (Philippines) Pornographic; depicting nudity.

Steep or abrupt.

(courageous): audacious, brave, courageous, daring, forward, doughty

See also Thesaurus:brave