Why is domo used also to say hello?


I'm confused 'domo' literally means 'very' so I can't understand why they use
it as a way of greeting




The modern day use of どうも as a greetings stems from the Edo period phrase
どうも言えぬ, lit. "unable to speak in spite of oneself", used positively much like
the way we use the English word "awesome" today. The どうも here was taken from
the phrase and was used like すごく or 大変 (which would be translated as "very" or
"quite).

> どうもお久しぶりでございます
>
> どうもありがとうございます
>
> どうもすみません
>
> どうもお世話になっています／なりました

どうも alone as a greeting is actually a shortening of the above sentences. One
of the strong points of this is that this one "greeting" can have many
implications and is so flexible. Of course, some people find it rude and would
prefer that the full sentence is used.

[Here's a link about the etymology of
どうも](http://bizmakoto.jp/makoto/articles/1303/28/news006.html)

