This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

• Lexulous
• Wordscraper
• Wordosaur

adj. Smart in appearance or dress; stylish.

v. To make attractive, stylish, or up-to-date: spiffying up my wardrobe.

adj. Dapper; fine or neat, especially in style of clothing or other appearance.

Spruce; well-dressed.

adj. marked by up-to-dateness in dress and manners

"Plus, they come in spiffy designs like mod half-globes and minimalist cylinders."

fashionable    stylish   

spruce up    spiv    spiff up   

spiffier    spiffiest   

spiffing    spivvy   

Giffy    iffy    jiffy    sniffy   

seersucker    skintight    asumi    transimpedance    favoriter    marble-tiled    onset    full-dress    fairtrade    oil-drilling