つつしんんじゃう
tsutsushin'nja u

Adverb
Godan Verb (u)

The completive aspect (contracted form) - indicates completion or regret of 謹んで

1. To do (something) carefully/humbly/respectfully... and then (regretfully/completely) do it.; To do (something) carefully/humbly/respectfully... and it's finished.

Completed Action
Colloquial