noun, na-adjective
great nuisance; extremely annoying; quite embarrassing
A yojijukugo expressing strong annoyance or embarrassment caused by someone or something. Often used in formal complaints or apologies.
彼の無責任な行動は迷惑千万だ。
His irresponsible behavior is a great nuisance.
お手数をおかけして迷惑千万に存じます。
I am extremely sorry for causing you so much trouble.