adjective / noun
flat
Lacking the liveliness or fullness normally expected.
The actors know their lines, but the performance feels flat.
Etymology
The lack of contour in a flat surface became an image for missing liveliness or richness. A performance, taste, or sound may seem flat when its expected lift is absent.
More examples
- Without a little salt, the soup tastes flat.
- This soda is flat because the bottle was left open.
- The rear tire is flat and needs air.
- She keeps a spare tire in case she gets a flat.
Forms
flat · flatter · flattest · flats
flatness noun — A lack of energy, interest, or flavor.