FLATTEST

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

Example: "A flat desk"

• level  8
• plane  7

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"

• categoric  14
• categorical  16
• unconditional  16

Stretched out and lying at full length along the ground

Example: "Found himself lying flat on the floor"

• prostrate  11

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

• compressed  17

Lacking taste or flavor or tang

Example: "A bland diet"

• bland  8
• flavorless  16
• flavourless  17
• insipid  10
• savorless  12
• savourless  13
• vapid  11

Lacking stimulating characteristics; uninteresting

Example: "A bland little drama"

• bland  8

Having lost effervescence

Example: "Flat beer"

Sounded or spoken in a tone unvarying in pitch

Example: "The owl's faint monotonous hooting"

• monotone  10
• monotonic  13
• monotonous  12

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"

• 2-dimensional
• two-dimensional

Not reflecting light; not glossy

Example: "Flat wall paint"

• mat  5
• matt  6
• matte  7
• matted  9

Commercially inactive

Example: "Flat sales for the month"