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

The Gallup poll now departs for the same Valhalla as the big three broadcast networks, bowling leagues, and roast beef for Sunday dinner—institutions that were once almost universally accepted but did not survive in a more divided and mutually suspicious America. —David Frum, The Atlantic, 21 Feb. 2026

My father was a convenience store owner, so convenience stores were both very familiar to me and at the same time rather suspicious. —Blake Simons, Variety, 20 Feb. 2026

Then review recent account activity and payment methods for any suspicious activity. —Kurt Knutsson, FOXNews.com, 20 Feb. 2026

The county terminated its contracts with Harm Reduction-SD in June 2025 after Stamos reported suspicious payments made by Knox, Stephan said. —Clara Harter, Los Angeles Times, 19 Feb. 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