1. not having reached full growth, maturity, or potential
2. having a low level of economic and industrial development
Usage: economics
3. lacking adequate development or improvement

Examples

• The underdeveloped muscles in his arm made lifting difficult.
• Many underdeveloped countries struggle with poverty and lack of infrastructure.
• The film’s underdeveloped plot left viewers confused.
• Her underdeveloped social skills made making friends challenging.
• The underdeveloped region lacked basic healthcare facilities.
• His underdeveloped argument failed to convince the jury.
• The underdeveloped seedlings needed more time to grow.