taru-adjective, adverb taking the 'to' particle
Obsolete literary word used almost exclusively in the adverbial phrase 恬として, meaning 'calmly', 'with indifference', or 'nonchalantly'.
See also: 恬として
Even when criticized, he remained nonchalant and didn't mind.
He sat quietly, calm and unruffled.
cool; indifferent; nonchalant; calm
coolly; indifferently; nonchalantly; calmly
Obsolete kanji form; the word is almost always encountered in the fixed expression 恬として.
The kanji 恬 is of Chinese origin, combining 心 (heart/mind) and 甜 (sweet) as a phonetic component, suggesting a sweet or calm state of mind. The exact historical derivation in Japanese is uncertain; the word is now obsolete outside the fixed expression 恬として.