flatness

F4L1A1T1N1E1S1S1
US/ˈflætnəs/

noun

The state of being flat

Similar
two-dimensionalityplanenesslusterlessnesslustrelessnessmatmattmattelanguor
OriginMiddle English flatnesse →
Less commonScrabble 11
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Meanings

nounflatness (countable and uncountable, plural flatnesses)

plural flatnesses

  1. countableuncountableThe state of being flat

    The flatness of the landscape facilitates views right across the Firth of Forth to Fife, before the railway begins to pierce the Edinburgh suburbs.

    2022 November 30, Paul Bigland, “Destination Oban: a Sunday in Scotland”, in RAIL, number 971, page 75
  2. countableuncountableThe state of being two-dimensional; planar : planarity
  3. countableuncountableThe state of being bland : dullness
  4. countableuncountableMattness, the quality of a painted surface which scatters or absorbs the light falling on it, so as to be substantially free from gloss or sheen
  5. countableuncountablebeveragesLack of bouquet and freshness of a wine, through too much aeration or infection with film yeasts
  6. countableuncountablemathematicsslim-tailedness or platykurtosis.

Synonyms & antonyms

nounthe property of having two dimensions

Similar
two-dimensionalityplaneness
Broader
dimensionality

nounthe property of having little or no contrast; lacking highlights or gloss

Similar
lusterlessnesslustrelessnessmatmattmatte
Broader
dullness

nouninactivity; showing an unusual lack of energy

Similar
languorlethargysluggishnessphlegm
Broader
inactivenessinactivityinertia
Also see
languorlethargylusterlessnesslustrelessnessmatmattmattephlegmplanenesssluggishness

Synonym sets from Open English WordNet, CC BY 4.0.

Origin

  1. Middle Englishflatnesse
  2. Englishflatness

From Middle English flatnesse, equivalent to flat + -ness.

More words from Middle English

Full word history & related roots →

Translations

Bulgarian гладкост, матовост
  • гладкост (gladkost)state of being flat
  • матовост (matovost)mattness
  • планарност (planarnost)state of being planar
  • отегчителност (otegčitelnost)state of being bland
French planéité, matité
  • planéitéstate of being flat
  • matitémattness
  • goût de l’éventlack of bouquet
  • planéitéstate of being planar
  • planitudestate of being planar
  • platitudestate of being bland
German Flachheit, Ebenheit
  • Flachheitstate of being flat
  • Ebenheitstate of being planar
Spanish planicidad, planitud
  • planicidadstate of being flat
  • planitudstate of being flat
  • matidezmattness
  • planaridadstate of being planar
  • aburriciónstate of being bland

Rhymes & wordplay

Rhymes with flatness

fatness
All rhymes →
Cite this entry
APA

flatness. (n.d.). In WatkinsX Dictionary. Retrieved November 2, 2026, from https://dictionary.watkinsx.com/word/flatness

MLA

“flatness.” WatkinsX Dictionary, https://dictionary.watkinsx.com/word/flatness. Accessed November 2, 2026.

Chicago

WatkinsX Dictionary, s.v. “flatness,” accessed November 2, 2026, https://dictionary.watkinsx.com/word/flatness.

Source: flatness on Wiktionary, CC BY-SA 4.0.