As a count noun. A wrong act or deed; a transgression, an offence, a sin. In later use chiefly: an instance of failing in one's duty or of not…

= failure, n. 1. Obsolete except in phrase without fail; now used only to strengthen an injunction or a promise; formerly also with statements of…

Turning aside, falling away; = declension, n. 2.

The action or an act of abandoning one's faith, religion, or moral duty; backsliding; apostasy.

A turning aside, swerving, deviation from a standard; turning aside (from rectitude, etc.); falling away; = declension, n. 2. Obsolete.

An act of abandoning or renouncing something; a defection. Also with from. Obsolete.

An act or instance of delinquency; a crime, an offence; a failure to pay a debt or tax. Also as a mass noun.

figurative. Deviation or declining from a standard; falling away (from one's allegiance), apostasy.

A desertion, repudiation of allegiance. Obsolete.

Failure in or neglect of one's duty or obligations; violation of a rule or code of conduct; spec. failure to pay a debt or tax. Also: the state or…

Neglect or violation of duty; immoral or criminal behaviour; delinquency. Also: a crime, an offence.

Immoral quality or character; culpability under moral law. Cf. delinquency, n. 1a.

In modern use implying a morally wrong or reprehensible abandonment or neglect; chiefly in the phrase dereliction of duty.