僕には理解できない

I can't understand

→ 僕
phrase Rare #42,215
I can't understand Literally, “to me, understanding is not possible.” 僕 is a casual, typically masculine way to say “I,” while には emphasizes that something is difficult or impossible for the speaker to understand.
JA: この説明は僕には理解できない。
EN: I can't understand this explanation.

君が言わんとする事は僕には理解できない

I can't understand what you're trying to say.

この本は僕には理解できない

I can't understand this book.

どうしてジェイムズいつも奥さんにけちをつけるのか僕には理解できない

I can't understand why James is always criticizing his wife.