boldness has 8 distinct synonyms spread across 3 of its 3 senses. Each sense below keeps its own list, because a synonym belongs to a meaning and not to a word: swapping one sense's substitute into another sense's sentence is how a thesaurus makes writing worse. Its one recorded opposite is timidity.
Counts are distinct word forms across every sense. A synonym that appears under three senses is counted once here and shown three times below, under each sense it belongs to.
the trait of being willing to undertake things that involve risk or danger
“the proposal required great boldness”
the quality of standing out strongly and distinctly
Synonyms, antonyms and the broader and narrower relations for boldness come from Princeton University’s WordNet. Full sources and licences.