Suspicious or doubtful; causing mistrust because something is unclear or questionable.
不審な人物が建物の周りを歩いていたので警備員に知らせた。
A suspicious person was walking around the building, so I informed the security guard.
銀行からの不審なメールは開かないほうがいい。
Don't open suspicious emails that claim to be from the bank.
彼の説明には不審な点が多かった。
There were many suspicious points in his explanation.