indescribable

English

From in- +‎ describe +‎ -able.

indescribable (comparative more indescribable, superlative most indescribable)

Impossible (or very difficult) to describe.
He proved it with indescribable mathematics.
- 1886 October – 1887 January, H[enry] Rider Haggard, She: A History of Adventure, London: Longmans, Green, and Co., published 1887, OCLC 1167497017:
  Presently the men set up the melancholy little chant that I had heard on the first night when we were captured in the whaleboat, and the effect produced by their voices was very curious, and quite indescribable.
- 1906 January–October, Joseph Conrad, chapter II, in The Secret Agent: A Simple Tale, London: Methuen & Co., […], published 1907, OCLC 270548466; The Secret Agent: A Simple Tale (Collection of British Authors; 3995), copyright edition, Leipzig: Bernhard Tauchnitz, 1907, OCLC 1107573959, page 15:
  But there was also about him an indescribable air which no mechanic could have acquired in the practice of his handicraft however dishonestly exercised: [...] the air of moral nihilism common to keepers of gambling hells and disorderly houses; [...]
Exceeding all description.
Our hotel had an indescribable view of the Bay of Naples.
- 1838, L[etitia] E[lizabeth] L[andon], Duty and Inclination, volume III, London: Henry Colburn, page 182:
  The time was when, had such an idea entered her mind, it would have been torture indescribable and agony the most intense; but then, subdued as was the usual warmth of her temperament, an awful suspension seemed to hold her feelings in control.

impossible, or very difficult to describe

Belarusian: неапіса́льны (njeapisálʹny), невыка́зны (njevykázny)
Bulgarian: неописуем (bg) (neopisuem)
Catalan: indescriptible
Chinese:
Mandarin: 無法形容／无法形容 (zh) (wúfǎ xíngróng), 不可名狀／不可名状 (zh) (bùkěmíngzhuàng)
Czech: nepopsatelný
Esperanto: nepriskribebla
Finnish: sanoin kuvaamaton (fi), kuvaamaton
French: indescriptible (fr)
Galician: indescritíbel (gl)
German: unbeschreiblich (de)
Gothic: 𐌿𐌽𐌿𐍃𐍃𐍀𐌹𐌻𐌻𐍉𐌸𐍃 (unusspillōþs)
Greek: ανεκδιήγητος (el) (anekdiígitos), απερίγραπτος (el) (aperígraptos), αχαρακτήριστος (el) (acharaktíristos), αδιήγητος (el) (adiígitos)
Ancient: ἀνεκδιήγητος (anekdiḗgētos)
Japanese: 言い表わせない (いいあらわせない, iiarawasenai)
Latin: inēnarrābilis
Manx: neufocklagh
Norwegian:
Bokmål: ubeskrivelig
Nynorsk: ubeskriveleg
Polish: nieopisany
Portuguese: indescritível (pt)
Romanian: indescriptibil (ro), inexprimabil (ro), de nedescris
Russian: неопису́емый (ru) (neopisújemyj), несказа́нный (ru) (neskazánnyj), невырази́мый (ru) (nevyrazímyj)
Spanish: indescriptible (es)
Swedish: obeskrivlig (sv)
Turkish: tarifsiz (tr), tarif edilemez
Ukrainian: неопи́саний (neopýsanyj), невимо́вний (nevymóvnyj), несказа́нний (neskazánnyj)

exceeding all description