suspicious

[suh-spish-uhs]
adjective
1.
tending to cause or excite suspicion; questionable: suspicious behavior.
2.
inclined to suspect, especially inclined to suspect evil; distrustful: a suspicious tyrant.
3.
full of or feeling suspicion.
4.
expressing or indicating suspicion: a suspicious glance.

Origin:
1300–50; Middle English < Latin suspīciōsus, equivalent to suspīci- (see suspicion) + -ōsus -ous

suspiciously, adverb
suspiciousness, noun
hypersuspicious, adjective
hypersuspiciously, adverb
hypersuspiciousness, noun
oversuspicious, adjective
oversuspiciously, adverb
oversuspiciousness, noun
presuspicious, adjective
presuspiciously, adverb
presuspiciousness, noun
self-suspicious, adjective
supersuspicious, adjective
supersuspiciously, adverb
supersuspiciousness, noun
unsuspicious, adjective
unsuspiciously, adverb
unsuspiciousness, noun


1. suspect, dubious, doubtful. 2. mistrustful, wary, disbelieving.
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
suspicious (səˈspɪʃəs)
 
adj
1.  exciting or liable to excite suspicion; questionable
2.  disposed to suspect something wrong
3.  indicative or expressive of suspicion
 
sus'piciously
 
adv
 
sus'piciousness
 
n

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Etymonline
Word Origin & History

suspicious
"deserving of or exciting suspicion," mid-14c., from O.Fr. suspecious, from L. 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.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
But you can't hide much in those file types without it being suspiciously large.
The camp was jealous of its privileges and looked suspiciously on strangers.
The claim sounds suspiciously reductionist, with complicated social realities
  subjugated to a few neat parameters.
He has been cursed at on the road, threatened by strangers, and glanced at
  suspiciously in malls.
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