放ほう胆たんほうたんMeanings1na-adjective, nounboldness; fearlessnessDescribes a person or attitude that is daring and unafraid. Often used in literary or formal contexts.彼かれの放ほう胆たんな行こう動どうに皆みなが驚おどろいた。Everyone was surprised by his bold action.放ほう胆たんな計けい画かくを立たてる。Make a fearless plan.