“I suspect” in Japanese
Short answer
I suspect in Japanese is “恐らく” (osoraku). Full meaning: probably, (most) likely, in all likelihood, I suspect, I dare say, I'm afraid.
Other ways to say “I suspect” in Japanese
恐らくは
osorakuha probably, (most) likely, in all likelihood, I suspect, I dare say, I'm afraid
おそらく
osoraku probably, (most) likely, in all likelihood, I suspect, I dare say, I'm afraid
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