From Longman Dictionary of Contemporary Englishnot all thatnot all thatVERYnot very It doesn’t sound all that good, does it? I don’t think it matters all that much. → all
Examples from the Corpus
not all that• My husband's not all that bothered one way or the other.• Most processes, at the frontline level, are not all that complicated.• In this she was not all that different from other people.• Charley is not all that enamored of Paris.• I understand she was found not all that far from her parents' house?• How they get almonds, then, is not all that marvellous a story.• The geographical context is not all that matters, but it is the most significant.• But not all that much more, not at the actual scene. 