Boldness, n.
The state or quality of being bold.
Syn. -- Courage; bravery; intrepidity; dauntlessness; hardihood; assurance.
Shades of meaning
Fernald has no entry of its own for boldness; he lists it under assurance, effrontery, impudence, pertness.
Where he writes about it:
In the bad sense assurance is less gross than impudence, which is (according to its etymology) a shameless boldness. — from assurance
Boldness is forward-stepping courage, spoken of with reference to the presence and observation of others; boldness, in the good sense, is courage viewed from the outside; but the word is frequently used in an unfavorable sense to indicate a lack of proper sensitiveness and modesty. — from effrontery
Synonyms
assuranceeffronteryimpudencepertnessarroganceassertionassumptionaudacitybrassbrisknessconfidenceflippancyforwardnesshardihoodimpertinenceincivilityinsolenceintrusivenesslivelinessofficiousnesspresumptionrudenesssaucinessself-assertionself-confidenceself-relianceshamelessnesssmartnesssprightlinesstrust