막무가내로 + 우기다 / 조르다 · 막무가내예요
stubbornly, obstinately, no matter what anyone says
Example
아이가 막무가내로 장난감을 사 달라고 졸랐어요.
The child stubbornly begged me to buy him a toy.
Word parts
막 none+무 without+가 can+내 how
Literally 'nothing can be done about it': impossible to reason with.
Good to know
Pronounced [망무가내로]: ㄱ before ㅁ becomes ㅇ (nasalization).
Related words