perhaps
たしか~
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The dictionaries say “perhaps” but in reality たしか is more like a “softener” that you put in front of a statement you ARE sure of, but you want to make it more polite/indirect.
$$$
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ひょっとして~
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This one is more like “could it be. . .? Naw, it couldn’t. . .but..??” Like if you run into someone that looks like your long-lost friend from 4th grade.
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万一~
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This is usually used for bad things only. “Just in case.” Kind of thing. “In the unlikely event of a water landing, pull out your inflatable cushions.”
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(Start-of-sentence words for “perhaps”)