Dictionary.net

Thing, fact, circumstance, of slight value or importance, wastes time on tt., the merest t. puts him out, (iron.) shall probably break our necks, but that is a t.; small amount esp. of money, as spare a t. for the porter, (adv.) seems a t. (rather) angry; confection of whipped cream or white of eggs, with pastry &c. soaked in wine, fruit, almonds, &c.; common pewter; t.-ring, kinds of puzzle-ring. (Vb) talk or act frivolously; t. with, treat (person, thing, matter) with flippancy or derision, refuse to take seriously, (also) occupy oneself carelessly with, toy with, (novel, cigarette, &c.); throw or fool away (time, energies, money, &c., on object); (part.) a trifling error, correction, circumstance, &c. (unimportant). Hence trifler n., triflingly adv. [Middle English]