taru-adjective, adverb taking the 'to' particle
calm and self-possessed; imperturbable; unruffled
Describes a person who remains completely calm and composed even under pressure. Often used in literary or formal contexts. As a 'taru' adjective, it typically appears in the form 泰然自若たる or 泰然自若として.
彼はどんな困難にも泰然自若としている。
He remains calm and self-possessed no matter what difficulties he faces.
泰然自若たる態度で交渉に臨んだ。
He approached the negotiations with an imperturbable attitude.