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un‧de‧vel‧oped

1 used in order to describe land which has not yet been used for building, farming etc :
an undeveloped stretch of coastline
an undeveloped stretch of coastline2 used in order to describe a country or area that does not have modern industry, and usually has a low standard of living [↪ underdeveloped]:
the undeveloped regions of the world
the undeveloped regions of the world3 not fully grown :
a child's undeveloped mind
a child's undeveloped mind