taru-adjective, adverb taking the 'to' particle
affectionately attached; reluctant to part
Obsolete literary term describing a lingering emotional attachment or reluctance to separate, often used in classical Chinese-influenced prose.
別れを惜しみ、依依として立ち去りがたい様子だった。
Reluctant to part, they seemed unable to tear themselves away.
The exact derivation is uncertain; the spelling 依依 is conventionally associated with the meaning of lingering attachment, likely from classical Chinese usage.