adverb taking the 'to' particle, taru-adjective
tearfully; shedding tears
Literary, somewhat archaic adverb or adjective describing a state of weeping or tears flowing. Often used with と (潸然と) or in classical-style prose.
彼は潸然と涙を流した。
He shed tears profusely.
潸然たる思いで別れを告げた。
With a tearful heart, they said goodbye.