1A doubt or question — something unclear or unconvincing, and the feeling of suspicion or query it produces; used in phrases like 疑問に思う (to find questionable) and 疑問を抱く (to harbor doubts).
その説明にはまだ疑問が残る。
I still have doubts about that explanation.
子供が「どうして？」と何度も疑問をぶつけてきた。
The child kept asking "why?" over and over.
この問題は多くの疑問を呼んでいる。
This issue has raised many questions.