► 名詞奥底  [おくそこ]  [liter]    
meaning:  bottom  rank: 4☆ 
彼は
心の奥底では
人種差別者だ ⇨ He is a racist deep down in his heart  
(☛ Usually used figuratively)More examples:- 彼女の胸の奥底にしまわれた気持ち ⇨ The feelings buried at the bottom of her heart
 - 心の奥底に巣食う偏見 ⇨ Prejudice that makes a nest at the deep end of the mind