na-adjective, noun which may take the genitive case particle 'no', noun
halfway; half-baked; half-hearted; incomplete
Describes something done without full commitment, left unfinished, or lacking thoroughness. Often carries a negative connotation of being unsatisfactory or irresponsible.
中途半端な態度では成功できない。
You can't succeed with a half-hearted attitude.
その計画は中途半端なまま終わった。
The plan ended up unfinished.
中途半端な知識で話すと恥をかくよ。
You'll embarrass yourself if you talk with half-baked knowledge.
It's not good to leave your work half-done and go home.
The plan ended up left half-finished.
If you start with a half-hearted attitude, you won't keep it up.
The story ended abruptly, left unfinished.
中途半端 is a colloquial, often critical term for something left halfway done, while 未完成 is a neutral, formal description of something not yet finished.