noun, na-adjective
dauntless and decisive; with fortitude and resolution
A yojijukugo describing a person of strong will who acts boldly and without hesitation. Formal and somewhat literary.
彼は剛毅果断なリーダーとして知られている。
He is known as a dauntless and decisive leader.
困難な状況でも剛毅果断に行動した。
Even in a difficult situation, they acted with fortitude and resolution.
A yojijukugo composed of 剛毅 (fortitude, dauntlessness) and 果断 (decisiveness). The exact historical derivation is uncertain, but the combination is conventionally associated with resolute and bold action.