1. most overly sentimental or foolishly romantic
Usage: informal
2. most foolish or silly
Usage: informal
3. containing the most sap (plant fluid)

Examples

• That was the sappiest love song I’ve ever heard.
• The movie’s ending was the sappiest part of the whole film.
• He made the sappiest face when she walked in.
• Don’t be so sappy about losing the game.
• The sappiest branches are the youngest ones on the tree.
• Spring wood is often the sappiest part of the trunk.
• She called it the sappiest romantic comedy ever made.