1) Cool, quaintly 2) Ducky 3) Exuberant shout 4) Grand old word 5) Great, teenage style 6) Happy Days exclamation 7) Just ducky 8) Like whoa 9) Marv 10) Nifty, to the beave 11) Old slangy word of enthusiasm 12) Old-fashioned cool 13) Peachy kin 14) Phat in the 1950s 15) Phat, old-style 16) Rad relative 1) Keen 2) Peachy 3) Peachy keen 4) Swell 
neat (def. 5).