This is the 9377th most frequent Japanese word.
磐石
A rock or stone symbolizing steadfastness, solidity, or reliability.
Here, '磐石' is used metaphorically to describe the unwavering reliability and strength of someone's plan.
彼の計画は磐石のように揺るぎない。
His plan is as solid as a rock.
In this sentence, '磐石' denotes a stable and reliable foundation necessary for achieving success.
磐石な基盤がなければ、成功は難しいです。
Success is difficult without a solid foundation.
Here, '磐石' emphasizes the durability and strength of a bond or relationship, indicating its steadfastness and reliability.