How to Say "I'm Not Sure" and "It Might Be" in Japanese: Hedging for Beginners
Learn elementary Japanese phrases for uncertainty, including tabun, kamoshiremasen, and wakaranai, so you can avoid making strong claims politely.
By LiamCulture & nuance · Yapr Learn
In Japanese conversation, sounding too certain can feel pushy, especially when you are guessing or lack full information. This lesson teaches beginner-friendly ways to soften statements: saying you are not sure, that something might be the case, or that you do not know. You will learn set phrases such as tabun, kamoshiremasen, and wakaranai, and see how they fit into natural short sentences. The focus is only on uncertainty; you will not practice expressing certainty here.
By the end, you can…
- say that I am not sure about something in Japanese.
- use tabun and kamoshiremasen to say something might be the case.
- say I do not know without sounding abrupt.
Listen once. Try it slowly. Then say it without looking.
Checking available voices…
たぶん。
Probably. / Maybe.
tabun
A very common short answer when you are not fully sure. It softens your statement but still suggests some possibility. It can stand alone as a reply.
わかりません。
I don't know. / I'm not sure.
wakarimasen
Polite and safe in most situations. Use it when you truly do not know or cannot answer.
よくわかりません。
I'm not really sure.
yoku wakarimasen
Softer than wakarimasen. The word yoku ('well') makes the uncertainty clearer and less blunt.
～かもしれません。
It might be ～. / Maybe it is ～.
~ kamoshiremasen
Attach this after a plain-form word, noun, or na-adjective to make a guess. It is polite and common in everyday speech.
たぶん～でしょう。
It's probably ～, I think.
tabun ~ deshou
Use with a noun or na-adjective before deshou, or after a plain-form verb or i-adjective. It sounds like a gentle guess, not a strong claim.
Pronunciation guides are approximate. Slow playback keeps the original pitch.
Make it make sense
Useful pattern
A simple way to hedge is to put tabun at the start of a sentence: たぶん雨です (tabun ame desu, 'It's probably rain'). For a guess, use ～かもしれません after a plain form: 雨かもしれません (ame kamoshiremasen, 'It might rain'). With nouns and na-adjectives, use ～かもしれません directly: 学生かもしれません (gakusei kamoshiremasen, 'He might be a student'). With i-adjectives, attach it to the plain form: 寒いかもしれません (samui kamoshiremasen, 'It might be cold'). Keep the ending polite with desu or masen when you are not sure.
When to use it
Use these phrases when you are guessing, when you have partial information, or when you do not want to sound too direct. For example, if a friend asks about tomorrow's weather, you can say たぶん晴れです (tabun hare desu, 'It's probably sunny'). If you are not sure at all, say よくわかりません (yoku wakarimasen, 'I'm not really sure'). Avoid using kamoshiremasen for things you know for certain; it is specifically for uncertainty. Note that たぶん雨です is a casual, slightly clipped way to say 'It's probably rain'; in polite speech, たぶん雨でしょう (tabun ame deshou) sounds more natural.
Listen to each line, then take one part and reply out loud.
あしたは あめですか。
Will it rain tomorrow?Ashita wa ame desu ka.たぶん あめです。でも、よく わかりません。
It will probably rain. But I'm not really sure.Tabun ame desu. Demo, yoku wakarimasen.そうですか。さむいですか。
I see. Is it cold?Sou desu ka. Samui desu ka.さむいかもしれません。
It might be cold.Samui kamoshiremasen.A little context goes a long way
Japanese often prefers soft, indirect answers in casual and polite conversation. Using tabun or kamoshiremasen can show you are being careful rather than hiding information. In formal situations, wakarimasen is safer than a blunt denial, and yoku wakarimasen adds extra politeness. These phrases are not rude; they are a normal way to avoid sounding overconfident. Note that たぶん雨です is casual and slightly clipped; in polite speech, たぶん雨でしょう sounds more natural.
One thing to watch for
Using たぶん with a strong, definite ending, as in たぶん雨ですよ (tabun ame desu yo), which can sound oddly confident.
Try this instead: Keep the ending neutral or add a hedge: たぶん雨です (tabun ame desu) or 雨かもしれません (ame kamoshiremasen). If you are unsure, avoid yo, which pushes your statement onto the listener.
Your turn
Try answering out loud before checking a possible answer.
1How do you say 'It might rain' politely in Japanese?
Show a sample answer
雨かもしれません。 (Ame kamoshiremasen.)
This uses the polite guess pattern ～かもしれません after the noun 雨. 雨でしょう (ame deshou) is also possible, but it sounds a little more confident.
2What is a polite way to say 'I'm not really sure'?
Show a sample answer
よくわかりません。 (Yoku wakarimasen.)
Yoku softens wakarimasen and clearly shows uncertainty. わかりません (wakarimasen) is also correct, but it can sound more direct.
3Change たぶん学生です (tabun gakusei desu) into a more uncertain guess.
Show a sample answer
学生かもしれません。 (Gakusei kamoshiremasen.)
This replaces the probable statement with a polite 'might be' pattern. たぶん学生でしょう (tabun gakusei deshou) is another valid softer guess.
When you are not sure in Japanese, use tabun for 'probably', kamoshiremasen for 'might be', and yoku wakarimasen for 'I'm not really sure'. These keep your speech polite and avoid strong claims.
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