taru-adjective, adverb taking the 'to' particle
calm and at rest; having nothing to do; still
Literary or classical expression describing a state of quiet inactivity or idleness. Often used in the form 居然として.
彼は居然として庭を眺めていた。
He was gazing at the garden in a calm, idle manner.
日曜の午後、居然として過ごすのも悪くない。
Spending a Sunday afternoon doing nothing in particular isn't bad either.