Both are in the N3 Vocab Deck and the difference is just one “お”.
I got from AI that, 大凡 is only used to indicate “roughly”, while 凡そ can be used for both “roughly” and “not at all”. Is that correct?
it doesnt seem like there is a meaningful difference
maybe it’s like the difference between using “until” and “till”
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Just noticed that this is also an N2 Grammar point, but is classified as N3 Vocab.
I will use the feedback button to reflect it.