suspect

[v. suh-spekt; n. suhs-pekt; adj. suhs-pekt, suh-spekt]
verb (used with object)
1.
to believe to be guilty, false, counterfeit, undesirable, defective, bad, etc., with little or no proof: to suspect a person of murder.
2.
to doubt or mistrust: I suspect his motives.
3.
to believe to be the case or to be likely or probable; surmise: I suspect his knowledge did not amount to much.
4.
to have some hint or foreknowledge of: I think she suspected the surprise.
verb (used without object)
5.
to believe something, especially something evil or wrong, to be the case; have suspicion.
noun
6.
a person who is suspected, especially one suspected of a crime, offense, or the like.
adjective
7.
suspected; open to or under suspicion.

Origin:
1250–1300; Middle English (adj.) < Latin suspectāre, equivalent to su- su- + spectāre, frequentative of specere to look at

suspectible, adjective
nonsuspect, noun, adjective
presuspect, verb (used with object)
unsuspecting, adjective
unsuspectingly, adverb


3. guess, conjecture, suppose.
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
suspect
 
vb
1.  (tr) to believe guilty of a specified offence without proof
2.  (tr) to think false, questionable, etc: she suspected his sincerity
3.  (tr; may take a clause as object) to surmise to be the case; think probable: to suspect fraud
4.  (intr) to have suspicion
 
n
5.  a person who is under suspicion
 
adj
6.  causing or open to suspicion
 
[C14: from Latin suspicere to mistrust, from sub- + specere to look]
 
sus'pecter
 
n
 
'suspectless
 
adj

unsuspecting (ˌʌnsəˈspɛktɪŋ)
 
adj
disposed to trust; not suspicious; trusting
 
unsus'pectingly
 
adv

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Etymonline
Word Origin & History

suspect
mid-14c., from O.Fr. suspect "suspicious," from L. suspectus "suspected, suspicious," pp. of suspicere "look up at, mistrust, suspect," from sub "up to" + specere "to look at" (see scope (1)). The notion is of "look at secretly," hence, "look at distrustfully." The verb is
attested from late 15c.; the noun meaning "a suspected person" is first recorded 1590s.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
Some predators take on the appearance of harmless animals or flowers to
  surprise unsuspecting prey.
But that there were ways to dramatize this to an unsuspecting world was the
  keenness of my understanding.
Serve side-by-side to an unsuspecting friend, and get their reaction.
Two more unsuspecting adults infected with the joy of crawling through a
  cardboard fort with a band of life-size puppets.
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