suspicious behavior; acting suspiciously
Describes a person's demeanor or actions that seem furtive, evasive, or give an impression of hiding something. Often used in police or security contexts, but also in everyday situations.
The police officer noticed his suspicious behavior.
試験中に挙動不審な動きをするとカンニングを疑われる。
If you act suspiciously during an exam, you'll be suspected of cheating.