If you say
that something will never do
or would never do
, you are saying
, often humorously, that you think
it is not appropriate
or not suitable in some way.
It would never do to have Henry there in her apartment.
I don't think it is an example of bad writing myself, otherwise I'd be agreeing with
Leavis, and that would never do.
COBUILD Advanced English Dictionary. Copyright © HarperCollins Publishers