suspicious

Suspicious is an adjective used to describe a person or thing that arouses doubt about honesty, safety, or intentions.

The term derives from Latin suspiciosus, from suspicere “to suspect”; the sense evolved through Old French into modern English.

In everyday language, something is suspicious if it seems unusual or could indicate wrongdoing. A person can be described as suspicious when their behavior suggests deceit or risk.

In security and law enforcement contexts, “suspicious” signals potential risk and may prompt investigations or safety protocols, such as inspecting a package or monitoring activity. However, labeling someone as suspicious should be based on observable indicators, not on prejudice or stereotype, and it is not proof of guilt.

Suspiciousness as a psychological or cultural trait can reflect cautious threat detection, skepticism, or bias. While prudent vigilance can be adaptive, excessive suspicion may erode trust and lead to unfair judgments.

Related terms include suspicion, distrust, and skepticism.