mar. 1  to damage or spoil to a certain extent; render less perfect, attractive, useful, etc.; impair or spoil: That billboard mars the view. 2  to disfigure, deface, or scar: The scratch marred the table.
Here are all the possible meanings and translations of the word betrayal. Princeton's WordNet(0.00 / 0 votes)Rate this definition: treachery, betrayal, treason, perfidy(noun) an act of deliberate betrayal. betrayal(noun) the quality of aiding an enemy.
The definition of treacherous is someone who is guilty of dishonesty or betrayal, or something that is dangerous or hazardous. 1  An example of treacherous is someone you thought was your friend who shares your secrets with everyone. 2  An example of treacherous is ground made slippery because of an ice storm.