frankly speaking; to be honest
Used as a set phrase to introduce a candid or blunt statement, often softening what follows.
Frankly speaking, I don't think that plan is very realistic.
To be honest, I was a bit surprised by his attitude.
More casual and direct; often used to express a strong opinion without softening.
A set phrase combining the adverbial form of 率直 (frank, straightforward) with the te-form of 言う (to say).