DONT TAKE AWAY THE POSSIBLE
Is there a word for impossible in Biblical hebrew?

As far as I know, I really could be wrong , there is not.Even in modern hebrew the word for impossible is בלתי אפשרי even here it is not one word but you "not"(בלתי) and "possible" (אפשרי) and only when you put them together doe they mean impossible, when you add the"not" taking away the possible.

So in other words when YOU take away the possible you are left with the impossible.IMPOSSIBLE should be a curse word for it is open for definition, malleable , flexible very accommodating depending on who is saying it and it is especially easy to say for those who are acolytes of average and voluntarily incarcerate themselves in a hub of complacency,self doubt ,and laziness not striving constantly for the best version of themselves

So when you fully accept and "allow" G-D in you will find that
I cant
impossible and similar victim words
will become heinous curse words because they deny you ,your family, your nation and indeed the world of the ever growing best version of you