Related words 徹てっ 底てい 的てき 徹底的 is an adjective meaning 'thorough' or 'exhaustive', while 金輪奈落 is an emphatic adverbial phrase meaning 'to the utmost limit' or 'to the very end'.
とことん とことん is a more common and casual adverb meaning 'thoroughly' or 'to the end', whereas 金輪奈落 is a literary yojijukugo with a stronger, more dramatic nuance.
Etymology A yojijukugo combining 金輪 (golden wheel, a Buddhist term for the strongest metal at the bottom of the world) and 奈落 (naraka, hell), literally meaning 'down to the golden wheel at the bottom of hell'. The phrase emphasizes reaching the absolute limit or the very end.
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