Antipathy is a voluntary or involuntary dislike for something or somebody, the opposite of sympathy. While antipathy may be induced by experience, it sometimes exists without a rational cause-and-effect explanation being present to the individuals involved.Thus, the origin of antipathy has been subject to various philosophical and psychological explanations, which some people find convincing and others regard as highly speculative. The exploration of a philosophical aspect for antipathy has been found in an essay by John Locke, an early modern 17th century philosopher.