わかりかねる

ichidan verb, intransitive verb

cannot understand; cannot tell; be unsure

Polite negative potential form of 分かる, used to express inability to understand or know something, often in formal or customer-service contexts.

• その点てんについては、私わたしには分わかりかねます。

  I'm afraid I cannot understand that point.

• この書しょ類るいの意い味みが分わかりかねるのですが、説せつ明めいしていただけますか。

  I'm unable to understand the meaning of this document; could you explain it?