Cynicism (noun)

1. A negative attitude, characterized by a belief that people are motivated purely by self-interest.
2. A belief that human actions are motivated solely by self-interest.

Origin:

Late 16th century: from french cynicisme or latin cynicismus, from greek kunikos "like a dog", from kuōn "dog", because the cynics, a sect of ancient greek philosophers, were so called from their belief that only the simple, natural life of a dog was worth living.

Examples:

1. His cynicism towards politics made him averse to voting.
2. She has a cynicism of the government and its ability to do good.
3. The cynicism in the article was palpable, as the author expressed doubt in the government's ability to effect real change.
4. The cynicism of the public towards politicians is growing.
5. Many people have a cynicism towards institutions and their ability to be fair and unbiased.