expression
not without; it's not that ...; slightly; somewhat
Used to acknowledge that something exists or is true to a limited degree, often as a hesitant or partial admission. Common in patterns like ～なくはない or ～ないことはない.
彼の言うことも、わからなくはない。
I can understand what he says to some extent.
その話、信じられなくはないけど、ちょっと怪しいね。
It's not that I can't believe that story, but it's a bit suspicious.