suspicious

adjective

sus·​pi·​cious sə-ˈspi-shəs 

1

: tending to arouse suspicion : questionable

suspicious characters

2

: disposed to suspect : distrustful

suspicious of strangers

3

: expressing or indicative of suspicion

a suspicious glance

suspiciously adverb

suspiciousness noun

Synonyms of suspicious

• questionable
• dubious
• disputable
• suspect
• doubtful
• problematic
• debatable

Examples of suspicious in a Sentence

We were instructed to report any suspicious activity in the neighborhood.

The suspicious vehicle was reported to police.

Suspicious characters were seen hanging around the bank.

He found a suspicious lump on his back and was afraid it might be cancer.

Officials are suspicious about her death.

His manner made me suspicious.

Recent Examples on the Web

If a homeowner finds a suspicious device, the department said not to touch it and call law enforcement. —Alexandra Koch, FOXNews.com, 1 Feb. 2026

Joining George in his fight to stop the slasher are a particularly suspicious student (Ian Sera) and a famous tennis pro (Lynda Day George) who, bored with the celebrity touring circuit, decides to join up as an undercover detective. —Kevin Jacobsen, Entertainment Weekly, 31 Jan. 2026

Many identity theft services offer free or paid monitoring that alert you if something suspicious happens. —Andreina Rodriguez, CNBC, 30 Jan. 2026

But the timing seems suspicious, and makes for an odd cover story launch at the paper, mostly because the general audience for a story out of the California Post will likely have no idea who the Safdies are. —Ryan Lattanzio, IndieWire, 30 Jan. 2026

Word History

First Known Use

14th century, in the meaning defined at sense 1

Rhymes for suspicious

• adventitious
• cementitious
• expeditious
• inauspicious
• injudicious
• meretricious
• repetitious
• superstitious
• surreptitious
• unambitious
• unpropitious
• unsuspicious

Kids Definition

suspicious

adjective

sus·​pi·​cious sə-ˈspish-əs 

1

: likely to arouse suspicion : questionable

suspicious behavior

2

: likely to suspect or distrust

suspicious of strangers

3

: showing suspicion

a suspicious glance

suspiciously adverb

suspiciousness noun