rock-solid

1. ADJ Something that is rock-solid is extremely hard. 十分堅(jiān)硬的

Freeze it only until firm but not rock solid. 把它凍硬，但是不要像石頭一樣硬。

2. ADJ If you describe someone or something as rock-solid, you approve of them because they are extremely reliable or unlikely to change. 十分可靠的 ; 不易改變的[表贊許]

Mayhew is a man of rock-solid integrity. 梅休是一個(gè)正直可靠的男人。