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

Jen is not particularly enthused, Mayci is suspicious of Demi’s motivations, and Taylor is skeptical about anyone taking real accountability. —Olivia Crandall, Vulture, 15 Nov. 2025

Haunted by the suspicious death of his ailing mother, Ali, a university professor, coerces his enigmatic gardener to execute a cold-blooded act of vengeance. —Jill Goldsmith, Deadline, 14 Nov. 2025

Police also responded to the school at the dismissal time to ensure student safety, searched the school and did not locate anything suspicious. —Alec Johnson, jsonline.com, 14 Nov. 2025

This unsettling thriller about impotent (emotionally, literally) university professor Ali (Turkish star Ekin Koç), on the path to vengeance after the suspicious death of his mother, scored strong reviews (including my own) and the World Cinema Directing Award out of the Utah festival. —Ryan Lattanzio, IndieWire, 14 Nov. 2025

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