A bold person is a person who is brave and confident in themselves. It is used more to do with your interactions with people rather than to do with activities. The meaning is positive.
Compare:
"He's so bold, yesterday when he saw a really pretty girl he went over to her and asked for her phone number."
"He's so brave, he's been sky-diving and bungy-jumping lots of times."
"She boldly told her boss that she didn't agree with him."
"He was very brave. He went into the burning house and rescued the child."
"They were very bold and went over to Will Smith and asked for his autograph."
Adverb: boldly
Antonyms (opposite adjectives): afraid, cowardly, fearful, meek, shy, timid, weak
It also is the word we use to describe this - bold font! The meaning is similar - bold font is stronger and it stands out more than normal font.
