About altogether vs all_together
Altogether means completely or entirely. When you want say something in a group then you say all together. For example, 'They got the participants all together at the start line of the race.' However, if you want to say that something is entirely untrue, you would say,'It is altogether untrue to say that we knew of the evil designs of the trickster beforehand.'
Source: http://www.wsu.edu/
