none too (adverb phrase)Originally Posted by whl626
Structure = [negative adverb] + [comparative adverb]
Meaning = rather less than
I would be rather less than happy if you....
To be less than happy is to be upset.
As for who or what I'm less than happy with (e.g. the situation, the person, the party, etc.), it's not stated, so we don't really know given the context.
If we change 'happy' to 'pleased with you', however, we get a more specific meaning:
I would be rather less than pleased with you if you....
I would be upset with you.