(psych.) a faulty act, error, blunder, slip of the tongue (Webster's)

Parapraxes are actions committed "not as planned." 

In fact, the opposite is the case: the pattern characteristic of symptoms, parapraxes (Freudian slips) and dreams is that the repressed wish will come out, with poetic irony, in precisely the effort to control or avoid it. Unconscious hatred "kills with kindness." One is so busy suppressing a sexual thought that it slips out as an unconscious pun. (Ronald de Sousa, The Rationality of Emotions, p.85) (see return of repressed

Freud's Psychopathology of Everyday Life is an investigation of the unconscious through parapraxes such as forgetting. In this book Freud established the principle that nothing in our mental life is purely accidental. 

"Since Freud's time, ample evidence has accumulated from the study of neurosis, hypnotism, and parapraxes to show that his basic theses about the action of the unconscious were essentially correct." Edelman, Bright Air, Brilliant Fire, p 145)