Source : WordNet®

nifty
     adj : very good; "he did a bully job"; "a neat sports car"; "had a
           great time at the party"; "you look simply smashing"
           [syn: {bang-up}, {bully}, {corking}, {cracking}, {dandy},
            {great}, {groovy}, {keen}, {neat}, {not bad(p)}, {peachy},
            {slap-up}, {swell}, {smashing}]
     [also: {niftiest}, {niftier}]

niftier
     See {nifty}