SPIFFY is validvalid

stylish [adj SPIFFIER, SPIFFIEST] : SPIFFILY [adv], SPIFFINESS [n] / to make stylish [v SPIFFIED, SPIFFIES, SPIFFYING]

28,625 of 196,601 in NWL2023·also valid in CSW24

excellent [adj SPIFFIER, SPIFFIEST, SPIFFILY] / to make spiffy [v SPIFFIED, SPIFFYING, SPIFFIES]