backward country
Older, now often avoided term for a less economically developed nation. Can sound condescending or outdated.
Countries once called 'backward countries' have now achieved economic growth.
developing country; underdeveloped country
Dated and potentially sensitive term for a developing nation. Modern usage prefers 開発途上国 or 発展途上国.
See also: 開発途上国
Support for developing countries is an important issue for the international community.