ไม่ทราบว่า

Explanation

ไม่ทราบว่า consists of ไม่ “not,” ทราบ “to know” in a polite register, and ว่า, which introduces the following content. Its basic meaning is “not know whether/what...” Because ทราบ is more polite than รู้, the expression is also commonly placed before a question to make it less direct. In that use, it functions much like “May I ask...?” or “Could you tell me...?” rather than emphasizing a lack of knowledge. A useful pattern is ไม่ทราบว่า + the question content + ครับ/คะ. Adding the appropriate sentence-final polite particle makes the request sound complete and courteous.

Usage

It is common in shops, hotels, reception areas, phone calls, and workplaces when politely asking about locations, names, schedules, or someone's availability. It is also used in professional or formal conversation to say courteously that certain information is not known.

Caution

When ไม่ทราบว่า introduces a question, do not interpret it too literally as “I don't know.” It is often simply a polite softener. In relaxed conversation with close friends, ไม่รู้ว่า is the more usual way to say that you do not know something.

1 may I ask...? synonyms

• ขอถามว่า

  ขอถามว่า explicitly says that the speaker would like to ask something. ไม่ทราบว่า frames the request more indirectly and often sounds gentler.

• อยากทราบว่า

  อยากทราบว่า means “I would like to know...” and emphasizes the desire for information. ไม่ทราบว่า introduces the question through the idea that the speaker does not know.