"greatly appealing" is a valid and correct phrase in written English.
You can use it to describe something that is particularly attractive or attractive to a great degree. For example, "My new apartment is greatly appealing to me because of its stunning views of the city."
Its style may have been American, but its subject matter was indigenous and greatly appealing to its audience, accustomed to the dull propriety of government-regulated television.
In The Times Manohla Dargis called the film "greatly appealing if not especially adventurous, either for its director or for her admirers".
Writing in The New York Times, Manohla Dargis said that Ms. McDormand, as a splenetic clothing designer, was sensational and called the film "greatly appealing if not especially adventurous, either for its director or for her admirers".
Master limited partnerships (MLPs) and royalty income trusts have been greatly appealing to income-oriented investors over the last couple of years.
Mesoporous silica nanoparticles (MSNs) are greatly appealing for efficient drug delivery due to their excellent drug loading capacities.
Still, the cast, headed by the soprano Pamela Armstrong as the countess, is greatly appealing, and George Manahan conducts an assured and supple performance.
Apparently, these practical difficulties either complicate system design or greatly deteriorate the appealing low-power characteristics, making UWB based green communications not available.
Many advertisers find cost-per-action appealing, as it greatly reduces their risk, since they are not charged for ads that are ineffective.
For sellers, auctions may be appealing because they can greatly accelerate the sales process, reducing the costs of a mortgage, taxes, insurance and maintenance.
Greatly influenced by the writings of Jean-Jacques Rousseau and Montesquieu, Trinh began by appealing in vain to French colonialists in terms of their own revolutionary tradition.
