English ⇄ Russian

underexplored adj. stresses
gen.	малоисследованный (goser); мало изученный (Based in Bermuda, Kosmos is an independent oil and gas exploration and production company focusing on what it calls underexplored areas offshore and onshore in Africa. wordnik.com Alexander Demidov); на ранней стадии изученности ("This particular area where the four licenses have been awarded is an underexplored area," said Stuart Pinks , chief executive of the Canada-Nova Scotia Offshore Petroleum Board, which awarded the licenses. wordnik.com Alexander Demidov); малоразработанный (Not explored (either physically or intellectually) to the usual degree: This is an underexplored problem in ethics. Ant: overexplored. WT Alexander Demidov)
geol.	слабо изученный (О. Шишкова)
geophys.	недоизученный; недоразведанный; недостаточно изученный ("Expectations about the oil and gas potential of underexplored areas in the South China Sea tend to heighten perceptions of their strategic significance," said Tom Grieder , an energy analyst with IHS, a consulting firm. wordnik.com Alexander Demidov)

underexplored: 4 phrases in 2 subjects

Geology	2
Geophysics	2