That is improbable―not likely―(未来の事なら)―unlikely to happen.
There is no suitable one
There is no suitable one
That [It] can't be helped.
That won't do
That is not to be done―impossible―impracticable.
that will never do
いいきっかがない
We have to do something else.
We probably will have to come up with something else.
This is crap.
せかさないで
This won't do