She keeps a box of nifties on her desk for when she needs a quick smile.

She showed me a nifty little gadget that organizes cables.

He slipped a nifty into the conversation, causing embarrassed chuckles around the table.

I admired the gadget's niftiness as it solved multiple problems with a single clever design.

Of all the gadgets on the desk, that tiny multi-tool is the niftiest by far.