In a horizontal line or plane; not sloping.
Having a head at a very obtuse angle to the shaft.
Unable to emit power; dead.
Smooth; having no protrusions, indentations or other surface irregularities, or relatively so.
Lacking acidity without being sweet.
Not having an inflectional ending or sign, such as a noun used as an adjective, or an adjective as an adverb, without the addition of a formative suffix; or an infinitive without the sign "to".
Absolute; downright; peremptory.
Without variation in tone or hue (uniform), and dull (not glossy).
Without variation in level, quantity, value, tone etc.
Of fees, fares etc., fixed; unvarying.
Lowered by one semitone.
Without spin; spinless.
Having small or invisible breasts and/or buttocks.
At a consistently depressed level; consistently lacklustre.
Flattening at the ends.
With all or most of its carbon dioxide having come out of solution so that the drink no longer fizzes or contains any bubbles.
Exact.
Lacking liveliness or action; depressed; uninteresting; dull and boring.
Of a note or voice, lower in pitch than it should be.
Without variations in pitch.
Deflated, especially because of a puncture.
Having no variations in height.
Lacking in depth, substance, or believability; underdeveloped; one-dimensional.
A flat tyre/flat tire.
A rectangular wooden structure covered with masonite, lauan, or muslin, often produced in standard modules, that is used to build wall surfaces on stage. Flats can be painted and outfitted with doors and/or windows to depict a building or other part of a scene. It's a hard-surfaced alternative to a backcloth orbackdrop.
An area of level ground (sometimes covered with water).
A flat-bottomed boat, without keel, and of small draught.
An early kind of toy soldier having a flat design.
The palm of the hand, with the adjacent part of the fingers.
A large mail piece measuring at least 8 1/2 by 11 inches, such as catalogs, magazines, and unfolded paper enclosed in large envelopes.
A flat (i.e. plane) mirror
The flat side of a blade, as opposed to the sharp edge.
A subset of n-dimensional space that is congruent to a Euclidean space of lower dimension.
A flat, glossy children's book with few pages.
A platform on a wheel, upon which emblematic designs etc. are carried in processions.
A railroad car without a roof, and whose body is a platform without sides; a platform car or flatcar.
An apartment, usually on one level and usually consisting of more than one room.
Level ground in general.
A note played a semitone lower than a natural, denoted by the symbol ♭ placed after the letter representing the note (e.g., B♭) or in front of the note symbol (e.g. ♭♪).
A type of ladies' shoe with a very low heel.
Level horse-racing ground, as contrasted with courses incorporating jumps, or the racing done on such ground.
A wide, shallow container or pallet.
A straw hat, broad-brimmed and low-crowned.
A horizontal vein or ore deposit auxiliary to a main vein; also, any horizontal portion of a vein not elsewhere horizontal.
A cheater's die with the edges shaved to make certain rolls more likely.
Any of various hesperiid butterflies that spread their wings open when they land.
A thin, broad brush used in oil and watercolour painting.
A flat sheet for use on a bed.
the area in the centre of a racecourse.
A type of flat-soled running shoe without spikes.
Used to emphasize the smallness of the measurement.
Completely.
Without allowance for accrued interest.
Bluntly.
In the mile race, Smith's time was 3:58.56, and Brown's was four minutes flat.
Directly; flatly.
Exactly, precisely.
So as to be flat.
To make a flat call; to call without raising.
To fall from the pitch.
To become flat or flattened; to sink or fall to an even surface.
To depress in tone, as a musical note; especially, to lower in pitch by half a tone.
To dash or throw
To dash, rush
Perfectly horizontal or vertical; not diagonal or oblique.
Direct, undeviating.
Describing the bat as held so as not to incline to either side; on, or near a line running between the two wickets.
Making no exceptions or deviations in one's support of the organization and candidates of a political party.
Occurring between people of opposite sex (sometimes, but not always, specifically between heterosexual people).
Strait; narrow.
Conventional; mainstream; socially acceptable.
Thorough; utter; unqualified.
Of spirits: undiluted, unmixed; neat.
Concerning the property allowing the parallel transport of vectors along a course that keeps tangent vectors remain as such throughout that course (a course which is straight, a straight curve, is a geodesic).
Not plus size; thin.
In proper order; as it should be.
Heterosexual.
Serious rather than comedic.
Containing the names of all the regularly nominated candidates of a single party and no others.
Related to conventional sexual intercourse.
Free from dishonesty; honest, law-abiding.
Not crooked or bent; having a constant direction throughout its length.
In a row, in unbroken sequence; consecutive.
Not using alcohol, drugs, etc.
Describing the sets in a match of which the winner did not lose a single set.
Direct in communication; unevasive, straightforward.
To straighten.
A chiropractor who relies solely on spinal adjustment, with no other treatments.
Something that is not crooked or bent such as a part of a road or track.
Five cards in sequence.
A cigarette, particularly one containing tobacco instead of marijuana.
A heterosexual.
A normal person; someone in mainstream society.
Directly; without pause, delay or detour.
Continuously; without interruption or pause.
Of speech or information, without prevarication or holding back; directly; straightforwardly; plainly.
Of a direction relative to the subject, precisely; as if following a direct line.