Not grammatical; ungrammatical; not conforming to the rules of grammar or accepted usage. Opposite of <ant>grammatical</ant>.(adjective)
Gnu Collaboartive International Dictionary of English: licensed under The Code Project Open License (CPOL)
Use "ill-formed" in a sentence
"Plot, setting, characters major and minor—all come to life in his mouth because a short, ill-formed man had conceived, all of five minutes ago, the stunning notion of making a movie about mud wrestlers, carny hands, tragic but virtuous nightclub singers, doomed gangsters, sleazy Europeans."
"It's the attitudes toward the covers and the fiction, usually unread, that need to be both borne (because people are entitled to their opinions no matter how ill-formed,) and repudiated (when they have an ill-formed opinion, educate them about what you feel to be excellent material, don't join in with trashing one part of SFF, like cover treatments, just to try to promote another part.)"
"A disjointed story with ill-formed characters and pointless tangents."