Where does “막나이” come from?

막나이 (Korean) comes from Korean 막, from Korean 마구 — carelessly, recklessly, indiscriminately, at random.

Ancestry of “막나이”, step by step

막나이 traces back through two separate lines of ancestry.

via Korean 막

StepLanguageWordMeaning
1Korean막Synonym of 마구; rough, careless, of low quality;...
2Korean마구carelessly, recklessly, indiscriminately, at random

via Korean —이

StepLanguageWordMeaning
1Korean—이For non-honorific nouns ending in consonants, the nominative case particle marking it as the subject of a verb or adjective; see also Usage Notes
2Middle Korean이person

Words derived from “막나이”

Every word from Korean 마구 →Every word from Korean 막 →
막나이 — Etymology, Origin & Word History | Etymology Explorer