[sentence (plain form)] + と言えなくもない
[noun] + (だ)と言えなくもない
[na-adj] + (だ)と言えなくもない
[i-adj] + と言えなくもない
[verb (plain)] + と言えなくもない
The expression と言えなくもない is a nuanced, hedging statement meaning "it's not that one can't say…" or "one could arguably say…". It uses a double negative construction (いえない言えない "cannot say" + なくもない "it's not that … not") to cautiously acknowledge that a certain interpretation or claim has some validity, while stopping short of fully endorsing it.
This grammar point is used when the speaker partially agrees with a statement or wants to concede a point without committing to it entirely. It conveys a tone of reluctance, reservation, or careful qualification – common in formal discussion, debate, and written Japanese.
Attach と言えなくもない to a clause or phrase that represents the claim being partially conceded.
Compared to simply saying といえる言える ("one can say"), と言えなくもない is significantly weaker and more tentative. The speaker acknowledges the possibility but implies there are also reasons to disagree or hesitate.
と言えなくもない is characteristic of N1-level formal and literary Japanese, and mastering it helps convey intellectual nuance and measured agreement.