Undeveloped (adjective)

1. Not having been developed or advanced.
2. Not having been built upon or improved.
3. Not having reached full maturity or potential.

Origin:

Late 18th century: from un- (expressing negation) + developed.

Examples:

1. The undeveloped land was reserved for future construction.
2. The undeveloped country lacked modern infrastructure and technology.
3. The undeveloped film was ruined when it was accidentally exposed to light.
4. The undeveloped mind of the child was eager to learn.
5. The undeveloped talent was hidden and needed to be nurtured.