cynical
adjective
[ ˈsɪnɪk(ə)l ]
• believing that people are motivated purely by self-interest; distrustful of human sincerity or integrity.
• "he was brutally cynical and hardened to every sob story under the sun"
• concerned only with one's own interests and typically disregarding accepted standards in order to achieve them.
• "a cynical manipulation of public opinion"