The term "irrational" refers to thoughts, behaviors, or decisions that lack logical reasoning or sound judgment. When someone acts irrationally, they may make choices that seem unreasonable or contrary to common sense, often influenced by emotions rather than facts. In psychology, irrationality can manifest in various ways, such as cognitive biases or emotional responses that lead to poor decision-making. For example, a person might fear flying in an airplane due to a news report about a crash, despite statistics showing that flying is safer than driving.