flat
Definitions
Having a level, smooth surface without significant curves, bumps, or indentations.
Lacking interest, emotion, or spirit; dull or monotonous.
A set of rooms for living in, typically on one floor of a building.
Examples
The landscape was completely flat as far as the eye could see.
I had to change my tire because it went flat on the highway.
She spoke in a flat tone that made it hard to tell if she was joking.