Noun underdevelopment has 2 senses

• underdevelopment(n = noun.state) Array - state of inadequate development; "much poverty can be traced to the underdevelopment of industry"
is a kind of development

• underdevelopment(n = noun.process) Array - (photography) inadequate processing of film resulting in inadequate contrast; Array
is a kind of developing, development
Derived form verb underdevelop₁