究竟 くっきょう Also written きゅうきょう Meanings Adverb after all; in the end; finally な-adjective, の-adjective, Noun excellent; superb; handy; appropriate; ideal robust; brawny; muscular; strong; sturdy See also: 屈強 (くっきょう). Kanji 究 investigate. Read as ク. 竟 end; finally. Read as キョウ. Jinuma: Japanese Dictionary · Word lists