flattest

Adjective

flat (comparative flatter, superlative flattest)

1. Having no variations in height.
   • The land around here is flat.
   1. In a horizontal line or plane; not sloping.
      • a flat roof
   2. Smooth; having no protrusions, indentations or other surface irregularities, or relatively so.
      • The surface of the mirror must be completely flat.
   3. (slang) Having small or invisible breasts and/or buttocks.
      • Near-synonym: flat-chested
2. Without variation in level, quantity, value, tone etc.
   • The exchange rate has been flat for several weeks.
   1. At a consistently depressed level; consistently lacklustre.
      • Sales have been flat all year, and we've barely broken even.

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