a mistake; the state of being wrong in belief or behaviour

mistake; wrong

a lie (the usual word)

lie

(to make an) untrue statement (especially about something unimportant)

undetailed lie

(an example, instance of) falsely making oneself appear to be virtuous or good

deceitfulness, pretence

(an act of) disloyalty or being unfaithful, especially to a wife or husband

disloyalty to an obligation

a statement that one knows is not true

untruth