Undeveloped; not yet developed economically, technically, or infrastructurally (used for land, regions, countries, etc.).
この沿岸地域は未開発で自然が多く残っている。
This coastal area is undeveloped and still has much natural environment remaining.
政府は未開発地域のインフラ整備を進めている。
The government is promoting infrastructure development in undeveloped regions.
未開発の資源をどう活用するかが課題だ。
How to utilize undeveloped resources is a challenge.