yí​wèn HSK4

doubt

疑问 (疑問) yí​wèn
doubt noun
a point of uncertainty or a query that remains unresolved

There is no doubt that he is the best candidate for this job.

interrogation noun
the linguistic form or grammatical structure used to pose a question

A question mark is usually used at the end of an interrogative sentence.

Frequency

Movie subtitles
12.3 per million appears in 6% of films
Written text
16.3 per million

Details

HSK 2.0
Level 5
HSK 3.0
Level 4

Sources

Definitions
CC-CEDICT