This is the 12319th most frequent German word.
verstand
Understanding; intellect; mind.
In this sentence, 'Verstand' again denotes 'intellect' or 'intellectual capacity', used to compliment someone's mental faculties.
Sein Verstand ist beeindruckend.
His intellect is impressive.
Here, the verb 'verstanden' is used in its past participle form of 'verstehen', which means 'to understand'.
Ich habe nicht verstanden, was Du gesagt hast.
I did not understand what you said.
Here, 'Verstand' is used to refer to 'mind' or 'intellect', denoting intellectual sharpness or ability to think clearly.