tending to cause or excite suspicion; questionable: suspicious behavior.
inclined to suspect, especially inclined to suspect evil; distrustful: a suspicious tyrant.
full of or feeling suspicion.
expressing or indicating suspicion: a suspicious glance.

Origin of suspicious

1300–50; Middle English < Latin suspīciōsus, equivalent to suspīci- (see suspicion) + -ōsus -ous
Related formssus·pi·cious·ly, adverbsus·pi·cious·ness, nounhy·per·sus·pi·cious, adjectivehy·per·sus·pi·cious·ly, adverbhy·per·sus·pi·cious·ness, nouno·ver·sus·pi·cious, adjectiveo·ver·sus·pi·cious·ly, adverbo·ver·sus·pi·cious·ness, nounpre·sus·pi·cious, adjectivepre·sus·pi·cious·ly, adverbpre·sus·pi·cious·ness, nounself-sus·pi·cious, adjectivesu·per·sus·pi·cious, adjectivesu·per·sus·pi·cious·ly, adverbsu·per·sus·pi·cious·ness, nounun·sus·pi·cious, adjectiveun·sus·pi·cious·ly, adverbun·sus·pi·cious·ness, noun

Synonyms for suspicious

1. suspect, dubious, doubtful. 2. mistrustful, wary, disbelieving. Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Examples from the Web for suspicious

Contemporary Examples of suspicious

Historical Examples of suspicious

  • Now don't get suspicious, and tell me to mind my own business when I ask you questions.

    The Spenders

    Harry Leon Wilson

  • When this was swept away the floor presented no suspicious traces.

  • Despite the laughter there was a suspicious mist in Mr. Ried's eyes.

  • Faust went away more than ever suspicious of Crane and Diablo.


    W. A. Fraser

  • He told me that a suspicious character had been hanging about the hall, enquiring for me.

    The Foolish Lovers

    St. John G. Ervine

British Dictionary definitions for suspicious



exciting or liable to excite suspicion; questionable
disposed to suspect something wrong
indicative or expressive of suspicion
Derived Formssuspiciously, adverbsuspiciousness, noun
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Word Origin and History for suspicious

"deserving of or exciting suspicion," mid-14c., from Old French suspecious, from Latin suspiciosus "exciting suspicion" (see suspicion). Meaning "full of or inclined to feel suspicion" is attested from c.1400. Edgar Allan Poe (c.1845) proposed suspectful to take one of the two conflicting senses. Related: suspiciously; suspiciousness.

Online Etymology Dictionary, © 2010 Douglas Harper