Was heißt »sattelfest« auf Englisch?

Das Adjektiv sattelfest lässt sich wie folgt von Deutsch auf Englisch übersetzen:

Synonyme

He was a very experienced horseman.
You can count on him. He's very experienced. And although he does have a great deal of self-confidence, he never boasts about his achievements. You should know, however, that he is slow.
You should know. You're far more experienced than me.
You should know. You're far more experienced than I am.
We experienced that ourselves.
Have you recently experienced palpitations or felt like your heart was racing?
Within the last six months, have you experienced a significant loss?
Have you experienced nausea recently?
Have you ever experienced chest pain?
Have you experienced shortness of breath recently?
He's young but experienced.
I am very experienced.
And then it began to snow. April lived up to its reputation: during this one week, participants experienced all four seasons.
And then it began to snow. April was living up to its reputation: during this one week, participants experienced all four seasons.
When the moon approached the Earth, it experienced very strong deceleration. This slowdown ultimately led to our having a pleasant day and pleasant weather.
Videoconferencing platform Zoom experienced worldwide outages Monday morning, coinciding with the first day of remote classes for many schools and universities.
She experienced many difficulties.
She experienced a lot of difficulties.
The world has never experienced anything like this.
What are some culture shocks you experienced in Germany?