Believing the worst of human nature and motives; having a sneering disbelief in e.g. selflessness of others; SYN. misanthropic, misanthropical.

1. Fraught with uncertainty or doubt; SYN. dubious.
2. Open to doubt or suspicion; SYN. dubious, dubitable, in question.
3. Unsettled in mind or opinion; SYN. tentative.

ETYM Latin incredulus. Related to In- not, and Credulous.
Not disposed or willing to believe.

Chiefly British variant of skeptical.

Relating to, characteristic of, or marked by skepticism

ETYM Old Eng. suspecious; cf. Latin suspiciosus. Related to Suspicion.
1. Inclined to suspect; tending to suspicion.
2. Prompting suspicion; appearing suspect or deceitful.