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From The Collaborative International Dictionary of English v.0.48:
Suspicious \Sus*pi"cious\, a. [OE. suspecious; cf. L. suspiciosus. See Suspicion.] 1. Inclined to suspect; given or prone to suspicion; apt to imagine without proof. [1913 Webster] Nature itself, after it has done an injury, will ever be suspicious; and no man can love the person he suspects. --South. [1913 Webster] Many mischievous insects are daily at work to make men of merit suspicious of each other. --Pope. [1913 Webster] 2. Indicating suspicion, mistrust, or fear. [1913 Webster] We have a suspicious, fearful, constrained countenance. --Swift. [1913 Webster] 3. Liable to suspicion; adapted to raise suspicion; giving reason to imagine ill; questionable; as, an author of suspicious innovations; suspicious circumstances. [1913 Webster] I spy a black, suspicious, threatening could. --Shak. [1913 Webster] Syn: Jealous; distrustful; mistrustful; doubtful; questionable. See Jealous. [1913 Webster] -- Sus*pi"cious*ly, adv. -- Sus*pi"cious*ness, n. [1913 Webster]