honestly speaking; to be frank; in all honesty
Used as a sentence adverb to preface a candid or potentially blunt statement. Common in both casual and formal speech.
To be honest, I'm against that plan.
Frankly, it doesn't taste very good.
Standard spelling; the kana ところ is more common in this phrase.
Kanji spelling 所 is also used but less frequent in this expression.
From 正直 (honest) + な (attributive) + ところ (place/point), literally 'at the honest point', used idiomatically as 'honestly speaking'.