The phrase "really effectively" is grammatically correct and can be used in written English.
It is an adverb phrase that describes the manner in which something is done. Example: The new marketing strategy was implemented really effectively, resulting in a significant increase in sales.
Beaver activity has filtered out the impurities really effectively, like a good reed system might do".
"The serve is such a big weapon on grass, and both use it really effectively.
He was, after all, only able to communicate really effectively with Tony Hart and Chas.
It removes all make-up really effectively and leaves skin ultra soft, gently scented and with a beautiful glowy sheen.
"The only thing they could do was beat me up, and they did it really effectively," he says.
It's lonely to really effectively live your life, and anyone you can get help from or give help to, that's part of your obligation.
China's future choices depend on whether "clean coal" can really work effectively and on a large scale.
A lot of what consultants do is stuff that senior management ought to be doing, which is really communicating effectively at all levels and putting those ideas together.
"What she really does effectively is to show how a photograph can persuade you into believing something that may or may not be true".
In other words, there's a threshold below which a presidential candidate can't really compete effectively, and that number — whether it's $500 million or something less — is outlandish enough that it should give us pause.
Seizing the insights of psychological science from what makes children thrive (prevent disorder by improving parenting skills and you avoid massive bills later on) to what helps professionals really work effectively with service users.
