This is the 2208th most frequent Japanese word.
疑問
Question; doubt.
疑問 refers to uncertainties or doubts about the theory discussed.
その理論にはまだ多くの疑問が残されている。
Many doubts remain about that theory.
疑問 is used to express skepticism or suspicion towards the individual's story.
彼の話に疑問を持つ人が多い。
Many people have doubts about his story.
疑問 indicates a question or problem that requires explanation or resolution.