1 (of liquids) having a mass of small bubbles on the surface: frothy coffee * a frothy mixture of eggs and milk * Add the eggs and beat until frothy.
2 seeming attractive and enjoyable but having no real value: frothy romantic novels
3 (of clothes or cloth) light and delicate: a frothy pink dresshttp://www.oup.com/oald-bin/web_getald7index1a.pl
froth·y (frôÆth", frothÆ"), adj., froth·i·er, froth·i·est.
1.of, like, or having froth; foamy.
2.unsubstantial; trifling; shallow; empty.
[Random House Webster's Unabridged Dictionary]