“Whether or not” in Japanese
Short answer
Whether or not in Japanese is “か否か” (kainaka). Full meaning: whether or not.
Other ways to say “Whether or not” in Japanese
かどうか
kadouka whether or not (in phrases like "I don't know whether or not I can come")
あろうとなかろう
aroutonakarou whether or not, presence or absence
や否や
yainaya the minute (that) ..., no sooner than ..., as soon as; whether or not
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