adverb taking the 'to' particle, taru-adjective
Archaic literary word describing a state of calmness or tranquility. Used adverbially with と or as a taru-adjective in classical-style writing. Modern equivalents include 穏やか or 平静.
See also: 晏如
彼は晏然として動じなかった。
He remained calm and unperturbed.