1. not changed or modified to suit new conditions or requirements
2. not suited or fitted to a particular environment or situation

Examples

• The unadapted software crashed frequently on the new operating system.
• Many species remain unadapted to the rapidly changing climate.
• The unadapted curriculum failed to meet modern educational standards.
• His unadapted teaching methods confused the digital-native students.
• The building’s unadapted design made it unsuitable for wheelchair access.
• The unadapted plants struggled to survive in the desert environment.