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remnant; fragment; incomplete set; incompleteness
fraction; odd sum
halfway; half-hearted; perfunctory
irresponsible; foolish
半端な気持ちで始めると必ず途中で挫折するだろう。
If you start half-heartedly, you'll definitely give up midway.
中途半端な結果に終わって後悔している状態なのだ。
I regret it ended with an incomplete result.
半端な知識で意見を言うのは危険なことだと思う。
I think it's dangerous to give opinions with incomplete knowledge.