HackerVoca

lavish : expend, waste, squander
lawful : legal, legitimate, valid
1 a valid ticket, document, or agreement can be used legally or is officially acceptable, especially for a fixed period of time or according to certain conditions: a valid passport | Your return ticket is valid for three months.

2 valid reason/argument/criticism etc a reason, argument etc that is based on what is true or sensible, and so should be accepted or treated in a serious way: His point about staff shortages was a valid one.

-validity / noun [uncountable]: I would question the validity of that statement.