— niftily , adv.
/nif"tee/ , adj., niftier, niftiest , n. , pl. nifties . Informal.
adj.
1. attractively stylish or smart: a nifty new dress for Easter.
2. very good; fine; excellent: a nifty idea.
3. substantial; sizable: We sold the car for a nifty profit.
n.
4. something nifty, as a clever remark or joke.
[ 1860-65, Amer.; of obscure orig. ]