flat

About 32.14 uses per million words.

Meaning

adjective Having no variations in height.
The land around here is flat.
adjective In a horizontal line or plane; not sloping.
a flat roof
adjective Smooth; having no protrusions, indentations or other surface irregularities, or relatively so.
The surface of the mirror must be completely flat.
adjective Having small or invisible breasts and/or buttocks.
That girl is completely flat on both sides.
adjective Without variation in level, quantity, value, tone etc.
The exchange rate has been flat for several weeks.
adjective At a consistently depressed level; consistently lacklustre.
Sales have been flat all year, and we've barely broken even.
adjective Of fees, fares etc., fixed; unvarying.
a flat fee
adjective Without variations in pitch.
He delivered the speech in a flat tone.