Factum Infectum Fieri Nequit Law and Legal Definition

Factum infectum fieri nequit means “a thing done cannot be undone.” For example, if a thief has completed the act of theft and runs abandoning the stolen goods, the theft committed cannot be undone. The consequence of the act cannot be avoided by the thief’s subsequent act. The maxim holds good as far as the doer is concerned. When a thing has been done that cannot be undone, a person who is wronged by the act can only claim for damages. However, when it is possible to rescind the thing that is wrongly done, courts can set it aside and give damages also when the things have been sustained.