cynical / sinical [ˈsɪnɪkəl]
cynical – adj. – 1. of or characteristic of a cynic; incredulous of human goodness; 2. (of behaviour, etc.) disregarding normal standards, especially of morality; 3. sneering, mocking, sarcastic
sinical – adj. – of or relating to a sine, or sines, or founded on sines