FLATTEST

Having a surface without slope, tilt in which no part is higher or lower than another

Example: "A flat desk"

Having a relatively broad surface in relation to depth or thickness

Example: "Flat computer monitors"

Not modified or restricted by reservations

Example: "A categorical denial"

Stretched out and lying at full length along the ground

Example: "Found himself lying flat on the floor"

Flattened laterally along the whole length (e.g., certain leafstalks or flatfishes)

Lacking taste or flavor or tang

Example: "A bland diet"

Lacking stimulating characteristics; uninteresting

Example: "A bland little drama"

Having lost effervescence

Example: "Flat beer"

Sounded or spoken in a tone unvarying in pitch

Example: "The owl's faint monotonous hooting"

Horizontally level

Example: "A flat roof"

Lacking the expected range or depth; not designed to give an illusion or depth

Example: "A film with two-dimensional characters"

Not reflecting light; not glossy

Example: "Flat wall paint"

Commercially inactive

Example: "Flat sales for the month"