cynical
definition
believing that people are motivated by self-interest distrustful of human sincerity or integrity
example
Her cynical attitude towards politicians made it difficult for her to trust any of their promises.
synonyms
skepticaldistrustfuljaded
word origin — The word 'cynical' originates from the Greek word 'kynikos,' meaning 'dog-like,' which was used to describe the Cynics, a school of philosophy in ancient Greece that believed in living in accordance with nature and rejected societal conventions.