鉄壁 てっぺき Meanings Noun iron wall; impregnable fortress の-adjective impregnable; invulnerable; unassailable; cast-iron Kanji 鉄 iron. Read as テツ. 壁 wall. Read as ヘキ. Example sentences 相手チームは鉄壁の守りを固めている。The other team has an unbeatable defense. Words containing 鉄壁 金城鉄壁 (きんじょうてっぺき) impregnable castle (walls) Jinuma: Japanese Dictionary · Word lists