badly formed.
Linguistics. not conforming to the rules of a given language; ungrammatical (opposed to well-formed).

Origin of ill-formed

First recorded in 1665–75
Related formsill-form·ed·ness [il-fawr-mid-nis, -fawrmd-] /ˈɪlˈfɔr mɪd nɪs, -ˈfɔrmd-/, noun Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Examples from the Web for ill-formed

Historical Examples of ill-formed

  • But our arms, shoulders, and chests are ill-formed and weak.

  • He was a fine big fellow; I have always been heavy and ill-formed.

    Ten Tales

    Franois Coppe

  • This he said with an ill-formed, crude idea which sprang to his mind at the moment.

    Cousin Henry

    Anthony Trollope

  • He was weak and ill-formed at his birth, so that even his mother despised him.


    Jacob Abbott

  • The object bore some resemblance to a string of ill-formed sausages.

    The White Chief

    Mayne Reid