When something is described as "half formed," it typically means that it is incomplete or still taking shape. However, there are several other ways to express this idea. For instance, words like "unfinished," "inchoate," or "rudimentary" all suggest an incomplete or preliminary state. "Embryonic" similarly connotes something that is still in the beginning stages of development. If you're looking for a more critical descriptor, "amateurish" or "underdeveloped" both convey a sense of lacking sophistication or polish. Finally, "nascent" or "incipient" imply that something is just starting to take shape, but has not yet fully materialized.