irrationality

Irrationality is cognition, thinking, talking, or acting without rationality.

Irrationality often has a negative connotation, as thinking and actions that are less useful or more illogical than other more rational alternatives. The concept of irrationality is especially important in Albert Ellis's rational emotive behavior therapy, where it is characterized specifically as the tendency and leaning that humans have to act, emote and think in ways that are inflexible, unrealistic, absolutist and most importantly self-defeating and socially defeating and destructive.