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Synonyms for Undeveloped (same or very similar meaning)

WordNet sense 1 (not made more desirable or valuable or profitable; especially not made ready for use or marketing):
unimproved

WordNet sense 2 (undeveloped or unused):
unexploited

WordNet sense 3 (not fully developed in mature animals):
rudimentary

WordNet sense 4 (lacking in development):
immature


From the ODE community, based on WordNetadd/edit