to tell the truth

Adverb

idiomatic not-comparable

(idiomatic) An attestation to the truthfulness and frankness of an associated statement.

Japanese Meaning

実のところ / 正直に言えば / 率直に言うと

I, to tell the truth, had no idea how to solve the problem until she explained it.

正直に言うと、彼女が説明するまではその問題をどう解決すればよいか全くわかりませんでした。

Sense（1）

(idiomatic) An attestation to the truthfulness and frankness of an associated statement.