How to say in Czech: He is at a loss for words.

English
is at a loss for words.
Czech
On nemá slov.
Can you say it in other words?
You just need to find the right words.
He didn’t keep his word.
He does not understand this word.
He will keep his word.
He is young.
He lives there.
He is divorced.
He is going home.
He is leaving in the morning.

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