undeveloped

As a noun taxonomy

is the science or the technique used to make a classification.

As an adjective undeveloped is

not developed or used.

As adjectives the difference between undeveloped and embryous

is that undeveloped is not developed or used while embryous is embryonic; undeveloped.

As an adjective undeveloped

is not developed or used.

As a noun greenspace is

an area of undeveloped landscape, such as park land left within a city during planning and zoning other areas for development.

As an adjective undeveloped

is not developed or used.

As a noun undevelopedness is

the state or condition of being undeveloped.