na-adjective
casual; offhand; as if nothing
Describes a manner or attitude that is casual, unconcerned, or as if something doesn't exist or matter. Often used adverbially with に.
彼は無げに質問に答えた。
He answered the question offhandedly.
彼女は無げな様子で部屋を出ていった。
She left the room with a casual air.