堅固

(1)immune to attack; incapable of being tampered with; "an impregnable fortress"; "fortifications that made the frontier inviolable"; "a secure telephone connection"

(2)攻撃に対しての免疫がある

(3)変更されることが出来ない

(4)of good quality and condition; solidly built; "a solid foundation"; "several substantial timber buildings"

(5)品質と状態が良い

(6)頑丈な造りの

(7)of a substantial character and not frivolous or superficial; "work of solid scholarship"; "based on solid facts"

(8)実体のある性質であり、軽薄でも表面的でもない

(1)