adj.未开发的；不发达的；未充分发育的
There are many undeveloped countries in Africa. 在非洲有许多不发达国家。
Starvation is a big problem in undeveloped countries. 饥饿在不发达国家是个很严重的问题。
The conception of the picture is undeveloped. 这幅画的构思不成熟。
