| flat | (adjective) (of a musical note) lowered in pitch by one chromatic semitone | - |
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| (adjective) lacking contrast or shading between tones | - |
| (adjective) not reflecting light; not glossy | Synonyms: mat, matt, matte, matted |
| (adjective) having a surface without slope, tilt in which no part is higher or lower than another | Synonyms: level, plane |
| (adjective) horizontally level | - |
| (adjective) commercially inactive | - |
| (adjective) lacking the expected range or depth; not designed to give an illusion or depth | Synonyms: 2-dimensional, two-dimensional |
| (adjective) having lost effervescence | - |
| (adjective) having a relatively broad surface in relation to depth or thickness | - |
| (adjective) lacking taste or flavor or tang | Synonyms: bland, flavorless, flavourless, insipid, savorless, savourless, vapid |
| (adjective) flattened laterally along the whole length (e.g., certain leafstalks or flatfishes) | Synonyms: compressed |
| (adjective) stretched out and lying at full length along the ground | Synonyms: prostrate |
| (adjective) sounded or spoken in a tone unvarying in pitch | Synonyms: monotone, monotonic, monotonous |
| (adjective) not modified or restricted by reservations | Synonyms: categoric, categorical, unconditional |
| (adjective) lacking stimulating characteristics; uninteresting | Synonyms: bland |
| flatbottom | (adjective) having a flat bottom | Synonyms: flat-bottom, flat-bottomed, flatbottomed |
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| flatbottomed | (adjective) having a flat bottom | Synonyms: flat-bottom, flat-bottomed, flatbottom |
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| flatfooted | (adjective) forthright and explicit | Synonyms: flat-footed |
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| (adjective) with feet flat on the ground; not tiptoe | Synonyms: flat-footed |
| (adjective) having broad flat feet that usually turn outward | Synonyms: flat-footed |
| (adjective) unprepared and unable to react quickly | Synonyms: flat-footed |
| flattened | (adjective) having been flattened | Synonyms: planate |
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| flattering | (adjective) showing or representing to advantage | - |
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| (adjective) obsequiously complimentary | Synonyms: adulatory |
| flatulent | (adjective) generating excessive gas in the alimentary canal | - |
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| (adjective) suffering from excessive gas in the alimentary canal | Synonyms: colicky, gassy |