expression
how kind of you; that's very nice of you
Polite expression used to thank someone for a kind act or offer. Often used as a standalone phrase.
ご親切に、ありがとうございます。
Thank you for your kindness.
ご親切に、助かりました。
That was very kind of you; you really helped me out.
adverb
Adverbial use meaning 'kindly' or 'in a kind manner'. Less common than the expression sense; often replaced by 親切に in less formal contexts.
彼はご親切に道を教えてくれた。
He kindly showed me the way.
Base noun/adjective meaning 'kindness' or 'kind'. ご親切に is the polite adverbial form used in expressions of gratitude.
Polite form of 親切に (kindly), with the honorific prefix ご added to the noun 親切 (kindness).