flattest

1. having a surface without slope, tilt in which no part is higher or lower than anotherExamples: "a flat desk"; "acres of level farmland"; "a plane surface"Synonyms: flat, level, plane

2. having a relatively broad surface in relation to depth or thicknessExamples: "flat computer monitors"Synonyms: flat

3. not modified or restricted by reservationsExamples: "a categorical denial"; "a flat refusal"Synonyms: categoric, categorical, flat, unconditional

4. stretched out and lying at full length along the groundExamples: "found himself lying flat on the floor"Synonyms: flat, prostrate

5. flattened laterally along the whole length (e.g., certain leafstalks or flatfishes)Synonyms: compressed, flat

6. lacking taste or flavor or tangExamples: "a bland diet"; "insipid hospital food"; "flavorless supermarket tomatoes"Synonyms: bland, flat, flavorless, flavourless, insipid, savorless, savourless, vapid