► 名詞
芯 [(1)しん] meaning: core rank: 2
☆ あいつは芯まで腐っている ⇨ He is rotten to the core
☆ 林檎の芯 ⇨ A core of an apple
芯 [(1)しん] [芯が強い] meaning: core rank: 2
☆ 彼女は芯が強い ⇨ She has a strong core, backbone (☛ In Japanese it always refers to a mental core. A physical core (abs, lower back) is 幹 (=trunk))
核 [(1)かく] meaning: core rank: 3
☆ 彼等三人の選手がチームの核を成している ⇨ Those three players form the nucleus of the team
核心 [かくしん] meaning: core rank: 4
☆ 誰も問題の核心を突こうとしない ⇨ Nobody is poking, tackling, the crux of the issue (☛ Literally “nucleus heart”)
性根 [しょうね] meaning: core rank: 4
☆ あいつは性根が腐っている ⇨ His root of personality is rotten. He is rotten to the core