1. 大胆：audaciously /大胆地/**地/ | audaciousness /大胆/**/ | audacity /大胆/厚脸/**/厚脸皮/旁若无人/无礼/

noun

1. aggressive boldness or unmitigated effrontery

e.g. he had the audacity to question my decision

Synonym: audacity

2. fearless daring

Synonym: audacitytemerity