| verb | praise somewhat dishonestly |
| adjective | having a surface without slope, tilt in which no part is higher or lower than another “a flat desk” |
| adjective | having a relatively broad surface in relation to depth or thickness “flat computer monitors” |
| adjective | not modified or restricted by reservations “a categorical denial” |
| adjective | stretched out and lying at full length along the ground “found himself lying flat on the floor” |
| adjective | lacking contrast or shading between tones |
| adjective | (of a musical note) lowered in pitch by one chromatic semitone “B flat” |
| adjective | flattened laterally along the whole length (e.g., certain leafstalks or flatfishes) |
| adjective | lacking taste or flavor or tang “a bland diet” |
| adjective | lacking stimulating characteristics; uninteresting “a bland little drama” |
| adjective | having lost effervescence “flat beer” |
| adjective | sounded or spoken in a tone unvarying in pitch “the owl's faint monotonous hooting” |
| adjective | horizontally level “a flat roof” |
| adjective | lacking the expected range or depth; not designed to give an illusion or depth “a film with two-dimensional characters” |
| adjective | not reflecting light; not glossy “flat wall paint” |
| adjective | commercially inactive “flat sales for the month” |
| flatterer | noun | a person who uses flattery |
| flattery | noun | excessive or insincere praise |
| blandishment | noun | flattery intended to persuade |
| flatness | noun | the property of having two dimensions |
| plane | noun | (mathematics) an unbounded two-dimensional shape |
| planeness | noun | the property of having two dimensions |
| blandness | noun | lacking any distinctive or interesting taste property |
| flavorlessness | noun | the property of having no flavor |
| flavourlessness | noun | the property of having no flavor |
| insipidness | noun | lacking any distinctive or interesting taste property |
| insipidity | noun | lacking any distinctive or interesting taste property |
| savorlessness | noun | the property of having no flavor |
| savourlessness | noun | the property of having no flavor |
| monotone | noun | an unchanging intonation |
| matt | noun | the property of having little or no contrast; lacking highlights or gloss |
| matte | noun | the property of having little or no contrast; lacking highlights or gloss |