- 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
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
Examples from the Web for 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
This he said with an ill-formed, crude idea which sprang to his mind at the moment.Cousin Henry
He was weak and ill-formed at his birth, so that even his mother despised him.Nero
The object bore some resemblance to a string of ill-formed sausages.The White Chief