taru-adjective, adverb taking the 'to' particle
calm and indifferent; unperturbed; placid
Rare literary term describing a composed, detached attitude, often with a nuance of quiet indifference. Used in classical or formal written contexts.
彼は周囲の騒ぎにも淡然としていた。
He remained calm and indifferent despite the commotion around him.
淡然たる態度で批判を受け流した。
He brushed off the criticism with an unperturbed attitude.
The exact derivation is uncertain; the kanji 淡 (light, faint) and 然 (state, condition) combine to suggest a state of being faint or indifferent.