- flat, level, plane - having a horizontal surface in which no part is higher or lower than another; "a flat desk"; "acres of level farmland"; "a plane surface"
Antonym: uneven (indirect, via even)
- flat - having no depth or thickness
Antonyms: cubic, three-dimensional (indirect, via linear, planar)
Antonyms: linear, one-dimensional (indirect, via planar, cubic)
- categoric, categorical, flat, unconditional - not modified or restricted by reservations; "a categorical denial"; "a flat refusal"
Antonym: qualified (indirect, via unqualified)
- flat, prostrate - stretched out and lying at full length along the ground; "found himself lying flat on the floor"
Antonyms: erect, vertical, upright (indirect, via unerect)
- flat - lacking contrast or shading between tones
Antonym: contrasty
- flat - lowered in pitch by one chromatic semitone; "B flat"
Antonyms: natural, sharp
- compressed, flat - flattened laterally along the whole length (e.g., certain leafstalks or flatfishes)
Antonym: thick (indirect, via thin)
- bland, flat, flavorless, flavourless, insipid, savorless, savourless, vapid - lacking taste or flavor or tang; "a bland diet"; "insipid hospital food"; "flavorless supermarket tomatoes"; "vapid beer"; "vapid tea"
Antonym: tasteful (indirect, via tasteless)
- bland, flat - lacking stimulating characteristics; uninteresting; "a bland little drama"; "a flat joke"
Antonym: stimulating (indirect, via unstimulating)
- flat - having lost effervescence; "flat beer"; "a flat cola"
Antonym: effervescent (indirect, via noneffervescent)
- flat, fixed - not increasing as the amount taxed increases
Antonym: progressive (indirect, via regressive)
- flat, unraised - not made with leavening; "most flat breads are made from unleavened dough"
Antonym: leavened (indirect, via unleavened)
- flat - parallel to the ground; "a flat roof"
Antonyms: vertical, perpendicular (indirect, via inclined, horizontal)
Antonym: inclined (indirect, via horizontal, vertical)
- flat, unpleated - without pleats
Antonym: folded (indirect, via unfolded)
- two-dimensional, flat - lacking the expected range or depth; not designed to give an illusion or depth; "a film with two-dimensional characters"; "a flat two-dimensional painting"
Antonyms: unidimensional, one-dimensional (indirect, via multidimensional)
- flat - (of a tire) completely or partially deflated
Antonym: inflated (indirect, via deflated)
- flat, mat, matt, matte, matted - not reflecting light; not glossy; "flat wall paint"; "a photograph with a matte finish"
Antonym: bright (indirect, via dull)
- flat - lacking variety in shading; "a flat unshaded painting"
Antonym: shaded (indirect, via unshaded)