謹つつしんで

adverb

respectfully; humbly; reverently

Formal adverb used in polite expressions, often in written or ceremonial contexts, to show deep respect or humility.

• 謹つつしんで新しん年ねんのご挨あい拶さつを申もうし上あげます。

  I respectfully offer New Year's greetings.

• 謹つつしんでお悔くやみ申もうし上あげます。

  I humbly express my condolences.