Synonyms of underdeveloped

Verb

1. underdevelop, develop

usage: process (a film or photographic plate) less than the required time or in an ineffective solution or at an insufficiently high temperature; "These photos are underdeveloped"

Adjective

1. developing, underdeveloped, nonindustrial (vs. industrial)

usage: relating to societies in which capital needed to industrialize is in short supply

2. underdeveloped, immature (vs. mature)

usage: not yet fully developed

Definition and meaning of underdeveloped (Dictionary)