unmatched bravery; peerless courage
Emphatic literary expression for bravery that has no equal. Often used in formal or dramatic descriptions of heroic acts.
Everyone was impressed by his act of peerless bravery.
勇敢 is the common word for 'brave'; 勇敢無比 is a stronger, more literary compound emphasizing that the bravery is unmatched.
Compound of 勇敢 (brave) and 無比 (unparalleled, peerless). The exact historical derivation is uncertain, but the word follows a common four-character idiom pattern.