na-adjective, noun
suspicious-looking; doubtful; questionable
Describes something that looks or seems suspicious, unreliable, or not quite right. Often used for people, behavior, or situations that give a dubious impression.
あの男は怪しげな行動をしている。
That man is behaving suspiciously.
怪しげな情報には気をつけてください。
Please be careful with questionable information.