Excessively sentimental or emotional. The movie was so sappy that I couldn't help but tear up during the final scene.
Containing or resembling sap; full of sap. The sappy branches were heavy and bent under the weight of the moisture.
Informal, chiefly North American: foolish, silly, or lacking good sense. He felt a bit sappy standing there with the oversized teddy bear.
Archaic: full of vitality or vigor; lively. The colt was a sappy young creature, kicking up its heels in the meadow.