solid as a rock

Steve Lazar is convinced the president’s mind “is solid as a rock.”

His performance was as solid as a rock against a Manchester United side who were totally outplayed.

The Chinese minister was quoted in the statement as saying their nations were “all-weather friends” whose friendship “was as solid as a rock.”

"There was fear for the first few times. When I first came. Now it has all, somehow, faded away. It's become as solid as a rock. Well, there are some fears - everyone has them".

On a visit to Moscow Tuesday, the Communist Party’s top diplomat Wang Yi said relations between Moscow and Beijing are “solid as a rock” and will “stand the test of the volatile international situation.”