1. [n]  being of a suspicious nature; "his suspiciousness destroyed his marriage"
2. [n]  doubt about someone's honesty
3. [n]  an impression that something might be the case; "he had an intuition that something had gone wrong"
4. [n]  the state of being suspected; "he tried to shield me from suspicion"

Suspicion
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1. \Sus*pi"cion\, n. [OE. suspecioun, OF. souspe[,c]on,
   F. soup[,c]on, L. suspectio a looking up to, an esteeming
   highly, suspicion, fr. suspicere to look up, to esteem, to
   mistrust. The modern form suspicion in English and French is
   in imitation of L. suspicio mistrust, suspicion. See
   {Suspect}, and cf. {Suspicious}.]
   1. The act of suspecting; the imagination or apprehension of
      the existence of something (esp. something wrong or
      hurtful) without proof, or upon very slight evidence, or
      upon no evidence.
            Suspicions among thoughts are like bats among birds,
            they ever fly by twilight.            --Bacon.
   2. Slight degree; suggestion; hint. [Colloq.]
            The features are mild but expressive, with just a
            suspicion . . . of saturnine or sarcastic humor.
                                                  --A. W. Ward.
   Syn: Jealousy; distrust; mistrust; diffidence; doubt.
   

2. \Sus*pi"cion\, v. t.
   To view with suspicion; to suspect; to doubt. [Obs. or Low]
   --South.