Gratuitous means to be given something, or to receive something, without payment or obligation.
It can also mean an action carried out or executed without cause, or an unjustified action.
It is also used in Law, where something is made or given, without receiving any value in return, as in a 'gratuitous agreement'.
He said that he would make the table completely free of charge, and we shook hands on the deal. We made a gratuitous agreement.
There is never any call for such gratuitous violence.
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