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From Ancient Greek ἄμορφος (ámorphos, without form, shapeless, deformed) (itself from ἀ- (a-, without) + μορφή (morphḗ, form) +‎ -ous.


  • IPA(key): /əˈmɔ(ɹ)fəs/, /eɪˈmɔ(ɹ)fəs/
  • (file)


amorphous (comparative more amorphous, superlative most amorphous)

  1. Lacking a definite form or clear shape.
    Synonyms: formless, shapeless; see also Thesaurus:amorphous
    The enormous pile of spaghetti landed on the floor in an amorphous heap.
  2. (by extension) Being without definite character or nature.
    • 1920, D.H. Lawrence, Women in Love, ch 1:
      Gudrun, new from her life in Chelsea and Sussex, shrank cruelly from this amorphous ugliness of a small colliery town in the Midlands. Yet forward she went, through the whole sordid gamut of pettiness, the long amorphous, gritty street.
  3. (by extension) Lacking organization or unity.
  4. (physics) In the non-crystalline solid state of a typically crystalline solid.
  5. (set theory, of a set) Infinite and not the disjoint union of two infinite subsets.

Derived terms[edit]


The translations below need to be checked and inserted above into the appropriate translation tables, removing any numbers. Numbers do not necessarily match those in definitions. See instructions at Wiktionary:Entry layout § Translations.

Further reading[edit]