"largely underdeveloped" is a correct and usable phrase in written English.
It can be used to describe something that is not fully developed or advanced. Example: "The rural areas of the country are largely underdeveloped compared to the urban areas." In this sentence, "largely underdeveloped" is used to describe the state of development in the rural areas, where there is a significant lack of progress or modernization.
However, the role of the private sector in a national quality monitoring system remains largely underdeveloped.
The country's tourism industry, largely underdeveloped during Libya's period under UN sanctions, has undergone significant expansion.
In the last years of the 20th century, public officials and private developers also seemed to realize that a largely underdeveloped area only one subway stop from Manhattan offered immense potential.
Mozambique's natural resources remained largely underdeveloped during the 1980s, but, with greater political stability after the peace accord of 1992, investment increased dramatically in a wide range of resource-development projects.
The concern underlying this paper was that agency was largely underdeveloped in the governance approaches we discussed.
'The transport fuel sector constitutes a large proportion of global energy demand but renewable alternatives, in comparison to other energy sectors, are largely underdeveloped (Schenk et al. 2008).
Since rice is a staple food for about two-thirds of the world's population, largely in underdeveloped regions, this is not good news.
Rotavirus killed 873,000 children last year, largely in underdeveloped countries.
In 1952 Wertheimer had just finished serving on a demolitions squad in the nascent Israeli military when he opened ISCAR out of his garage in Nahariya, a town in the Galilee, an underdeveloped, largely agricultural and very Arab region in northern Israel.
Building the company was difficult, Kazi says, because it focused on a sector that is underdeveloped, largely unregulated and underpaid.
"The nutritional needs of adolescent girls have been largely neglected, especially in underdeveloped regions of the world," reported nutrition NGO One Goal last year.
