The phrase "almost unexplored" is correct and usable in written English.
It can be used to describe a place, idea, or concept that has not been thoroughly examined or investigated.
Example: "The remote island remains almost unexplored, attracting adventurers and researchers alike."
Alternatives: "nearly untouched" or "barely investigated".
He & his men, estimated at 1000 strong lurk in the Sierra Maestra, in the 500-mile of almost unexplored mountain territory, inhabited by a handful of farmers said to be descendants of outlaws, who live in almost savage simplicity.
This topic is almost unexplored in the literature [31, 32].
However, this has been almost unexplored in the literature.
However, the interesting range of PhC-based devices was almost unexplored.
The effectiveness of bacterial inoculation under drought conditions in natural soil has been almost unexplored.
Surprisingly, their suitability as precursors for solid-state synthesis of magnetic nanoparticles is almost unexplored.
Together they make the largest mountain range on the planet, 50,000 miles long and almost entirely unexplored, as tall as the Andes but two miles deep.
pic.twitter.com/Wzna6akR1i December 31, 2013 The scientists were attempting to retrace the steps of Sir Douglas Mawson, the geologist who between 1911 and 1913 led the Australasian Antarctic Expedition to King George V Land and Adelie Land, parts of Antarctica that at the time were almost completely unexplored.
The domain of "transient" objects, which pop on and off unpredictably, is almost totally unexplored, because of the usual way of doing optical astronomy: scheduling time on the telescope months in advance, and using giant telescopes with tiny fields of view.
Moreover, the value-added utilisation of recycled C&DW in the construction of geosynthetic reinforced structures (steep slopes and retaining walls) is almost an unexplored field.
