It is grammatically correct in that all the parts of it are properly arranged according to their parts of speech and function.
However, it has no meaning. The word 'hypothetical' refers to 'hypothesis.' which is a statement proposed as an explanation of something, like a theory. You can't say that a person is like that. Those are characteristics that can't belong to a person.
It is perfectly possible to form a grammatical sentence that has no meaning. Chomsky's famous sentence "Colorless green ideas sleep furiously" was composed as an example of that. Your sentence is another.
No. You would say: Why does every one of us do stupid things at times?
They have seen rainbows in the sky many times in April.
It would be a complete sentence if it was grammatically correct. Exceptional times require exceptional measures. (The verb should match the subject, which is plural.)
3 times!
Adversity is tough times.
This sentence is grammatically correct but does not have much meaning.
8 times. I already told you that: that that "that" (that "that" that that teacher used) was grammatically correct.
It would be a complete sentence if it was grammatically correct. Exceptional times require exceptional measures. (The verb should match the subject, which is plural.)
No. You would say: Why does every one of us do stupid things at times?
As many times as you want, but I don't suggest it, and technically a sentence can go on for a long time so if you're asking how many times can it be said properly then there is no correct answer to our standards
In a line of dialogue in a story. Or if you are quoting a person. So if you were to say and 7 times consecutively, and i quoted you on paper, it would be grammatically correct.
They have seen rainbows in the sky many times in April.
i have heard it used, I'm not sure if it is correct but i have heard it used
No. Bad grammar and bad food. Use the "present perfect" form : "I have eaten at McDonald's many times."
Despite the fact that money was counted three times, it still fell short of the correct total.
I think you mean indubitibably, which means without a doubt. He is indubitably correct, which can be annoying at times.
Many times, hypothetical questions can be answered using deductive reasoning. Deductive reasoning means using logic, and this can sometimes help you determine the likely outcome for the matter in question.