だろうに LinksSentence search for だろうにEdit in JMdict Expressions (phrases, clauses, etc.)1. but I suppose; it seems; probably; I guessusu. sentence end, expressing suppositionもしかれ彼のじゅうしょ住所をし知っていれば、てがみ手紙をか書くだろうに。If I knew his address, I would write to him. Discussions Log in to talk about this word.