copout
noun
Definitions
Avoidance or inadequate performance of a task or duty; the action of copping out.
Example: His disappearance on the day of the audition was just a cop-out.
An excuse made in order to avoid performing a task or duty; a reason offered when someone cops out.
Example: It was a cop-out to say he couldn't sign the petition because he sprained his wrist.
A person who cops out.
Example: He's always a cop-out when there's hard work to be done.