Synonyms of 'no go'
▷ See go
I tried to get him to change his mind, but it was no go.
Copyright © 2016 by HarperCollins Publishers. All rights reserved.
If you say that something is futile, you mean there is no point in doing it, usually because it has no chance of succeeding.
a futile attempt to ward off the blow
Someone or something thing that is hopeless is certain to fail or be unsuccessful.
I don't believe your situation is as hopeless as you think.
Thesaurus for no go from the Collins English Thesaurus
impossible ; abortive or futile