1.
probably, I think, I suppose
Expresses conjecture or supposition about something uncertain.
2.
right?, isn't it?
Seeks confirmation or agreement from the listener (often with rising intonation).
そうだろう？
Right? Isn't that so?
面白かっただろう？
It was interesting, wasn't it?
だろう is the conjectural form of the copula だ.
Forms
- Plain form + だろう
- Noun/na-adjective + だろう (no だ before)
- i-adjective + だろう
Register
Plain. The polite equivalent is でしょう. In casual speech だろう can sound masculine; でしょ(う) is used by all speakers.
Common patterns
- Statement + だろう = conjecture (probably)
- Question word + だろう = wondering (I wonder...)
- Statement + だろう？(rising) = seeking confirmation (right?)
Similar words
Related Words
Related:
違いない (stronger certainty)
Keigo:
でしょう (polite)
Compare:
かもしれない (Possibility, "might be")