1. Not fully developed or advanced; lacking in economic, industrial, or social progress
The underdeveloped regions of the country lack proper infrastructure.
As regiões subdesenvolvidas do país carecem de infraestrutura adequada.
2. Not sufficiently grown or matured; incomplete in growth or development
The child's underdeveloped motor skills required therapy.
As habilidades motoras subdesenvolvidas da criança exigiam terapia.
3. In photography, not sufficiently processed or exposed
The underdeveloped film showed faint images.
O filme subdesenvolvido mostrava imagens fracas.