The Collaborative International Dictionary of English v.0.48:
Trifle \Tri"fle\, v. i. [imp. & p. p. Trifled; p. pr. & vb. n.
Trifling.] [OE. trifelen, truflen. See Trifle, n.]
To act or talk without seriousness, gravity, weight, or
dignity; to act or talk with levity; to indulge in light or
They trifle, and they beat the air about nothing which
toucheth us. --Hooker.
To trifle with, to play the fool with; to treat without
respect or seriousness; to mock; as, to trifle with one's
feelings, or with sacred things.