selectable.unselect

Fires when an item is unselected.

The callback has one parameter which returns a reference to the unselected item.

selectable.on("selectable.unselect", function(item) {

});

If you require a list of unselected items instead of listening for when each individual item is unselected then listen for the selectable.end event instead as this returns a list of items that were unselected during the current selection.