未完成

1. Origins, structure, and basic meaning

• Structure: 未完成(みかんせい) places 未, indicating something not yet reached, before 完成, completion.
• Basic usage: It describes something, such as a composition or model, that has not reached completion.

2. Common pitfalls and similar expressions

• How it differs from 未着手
  • 未着手(みちゃくしゅ) means not yet started. 未完成 concerns completion, so something can already have a recognizable form, like the model in the example.
• A continuing state with まま
  • 未完成のまま means that the unfinished state remained. It does not itself predict that the work will eventually be completed.