Not only is “completely” the definition they're quoting from the dictionary, it is also exactly what is exemplified by the examples, so I'm not sure what you mean by “don't fall under it”.

Ooooh, now I get it- I completely misunderstood that! Indeed, I can substitute every quiet with completely and it's meaning never changes from how it would've been interpreted!

(And I totally forgot to delete the comment too)

I just didn't realize that and only considered how I'd interpret the meaning of completely on is own. And that meaning doesn't translate to every example, hence my previous confusion

I didn't add completely, that's a quote directly from the Cambridge Dictionary.