immature and not fully developed / having a low level of economic productivity and technological sophistication / (photography) of a film that has had insufficient development before being fixed

simple past tense and past participle of underdevelop

present participle of underdevelop

Third-person singular simple present indicative form of underdevelop

To develop insufficiently.

The condition of being underdeveloped.

plural of underdevelopment

Synonym of underdevelopment (“state or condition of being underdeveloped”).