cynical
Definitions
Believing that people are motivated purely by self-interest; distrustful of human sincerity or integrity.
Concerned only with one's own interests and typically disregarding accepted or appropriate standards in order to achieve them.
Doubtful as to whether something will happen or whether it is worthwhile.
Examples
He developed a cynical view of politics after years of witnessing corruption in the government.
Despite her cynical attitude toward romance, she couldn't help but smile when he surprised her with flowers.
Synonyms
skeptical distrustful pessimistic doubting jaded misanthropic contemptuous