The Collaborative International Dictionary of English v.0.48:

Suspect \Sus*pect"\, a. [L. suspectus, p. p. of suspicere to
   look up, admire, esteem, to look at secretly or askance, to
   mistrust; sub under + specere to look: cf. F. suspect
   suspected, suspicious. See Spy, and cf. Suspicion.]
   1. Suspicious; inspiring distrust. [Obs.]
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            Suspect [was] his face, suspect his word also.
                                                  --Chaucer.
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   2. Suspected; distrusted. [Obs.]
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            What I can do or offer is suspect.    --Milton.
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The Collaborative International Dictionary of English v.0.48:

Suspect \Sus*pect"\, v. i.
   To imagine guilt; to have a suspicion or suspicions; to be
   suspicious.
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         If I suspect without cause, why then make sport at me.
                                                  --Shak.
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The Collaborative International Dictionary of English v.0.48:

Suspect \Sus*pect"\, n. [LL. suspectus. See Suspect, a.]
   1. Suspicion. [Obs.] --Chaucer.
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            So with suspect, with fear and grief, dismayed.
                                                  --Fairfax.
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   2. One who, or that which, is suspected; an object of
      suspicion; -- formerly applied to persons and things; now,
      only to persons suspected of crime. --Bacon.
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The Collaborative International Dictionary of English v.0.48:

Suspect \Sus*pect"\, v. t. [imp. & p. p. Suspected; p. pr. &
   vb. n. Suspecting.]
   1. To imagine to exist; to have a slight or vague opinion of
      the existence of, without proof, and often upon weak
      evidence or no evidence; to mistrust; to surmise; --
      commonly used regarding something unfavorable, hurtful, or
      wrong; as, to suspect the presence of disease.
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            Nothing makes a man suspect much, more than to know
            little; and therefore men should remedy suspicion by
            procuring to know more.               --Bacon.
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            From her hand I could suspect no ill. --Milton.
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   2. To imagine to be guilty, upon slight evidence, or without
      proof; as, to suspect one of equivocation.
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   3. To hold to be uncertain; to doubt; to mistrust; to
      distruct; as, to suspect the truth of a story. --Addison.
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   4. To look up to; to respect. [Obs.]
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   Syn: To mistrust; distrust; surmise; doubt.
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WordNet (r) 3.0 (2006):

suspect
    adj 1: not as expected; "there was something fishy about the
           accident"; "up to some funny business"; "some definitely
           queer goings-on"; "a shady deal"; "her motives were
           suspect"; "suspicious behavior" [syn: fishy, funny,
           shady, suspect, suspicious]
    n 1: someone who is under suspicion
    2: a person or institution against whom an action is brought in
       a court of law; the person being sued or accused [syn:
       defendant, suspect] [ant: complainant, plaintiff]
    v 1: imagine to be the case or true or probable; "I suspect he
         is a fugitive"; "I surmised that the butler did it" [syn:
         suspect, surmise]
    2: regard as untrustworthy; regard with suspicion; have no faith
       or confidence in [syn: distrust, mistrust, suspect]
       [ant: bank, rely, swear, trust]
    3: hold in suspicion; believe to be guilty; "The U.S. suspected
       Bin Laden as the mastermind behind the terrorist attacks"