What does "cynical" mean?

Additional senses

1. 2.Belonging to the sect of philosophers called cynics; having the qualities of a cynic; pertaining to, or resembling, the doctrines of the cynics.
2. 3.Given to sneering at rectitude and the conduct of life by moral principles; disbelieving in the reality of any human purposes which are not suggested or directed by self-interest or self-indulgence; as, a cynical man who scoffs at pretensions of integrity; characterized by such opinions; as, cynical views of human nature. Note: In prose, cynical is used rather than cynic, in the senses 1 and 4. Cynic spasm (Med.), a convulsive contraction of the muscles of one side of the face, producing a sort of grin, suggesting certain movements in the upper lip of a dog.