"Officially" (or so I believe) English doesn't have comparative adverbs (a single word rather than "more" + an adverb), but faster is in common usage as one, for example:
Do it faster
When strictly speaking one should say:
Do it more quickly
Is the former an error in grammar? Or has English (d)evolved to such an extent that faster may be used as a comparative adverb?
Best Answer
I don’t know where this myth got started, but adverbs and adjectives form inflections by degree in precisely the same way. There is no difference at all.
And it isn’t even the case that there is some rule that somehow exempts ‑ly modifiers — be they adjectives or adverbs, it doesn’t matter — from inflections of degree. They take either more or -er for comparatives, and either most or ‑est for superlatives. Watch:
Also, onliest has a long history, although it is now mostly confined to dialect.
And there is absolutely nothing whatsoever with saying:
No one, but no one, can ever say a word against against it.
Edit
Here are more examples of comparative adverbs.
Given that this is an adverbial use:
Can he then not walk cleaner? Similarly here:
Can they not sleep softer that way?
Consider this laughter:
Can I not laugh louder and longer?
Can a joke that falls flat, if retold, fall flatter?
If one day you’re sitting pretty, and things get even better the next day, couldn’t you be sitting prettier?
Could you not be harder-pressed to do something today than yesterday?
Consider these adverbial uses of dear:
If you paid dear yesterday, and dearer today, and paid dearest tomorrow, those are all normal inflections.
I could go on all day, but surely it is clear by now that there has never been any general “rule” forbidding inflecting adverbs by degree.
(Sure, there are some adverbs that you just don’t do that with, like now for example, but that is a wholly different matter. It is hard to be “nower” simply because now does not readily admit inflection by degree. But even for that one, you could probably put together a situation where it would somehow be understood.)