Unconverted (adjective)

1. Not converted; not having undergone conversion.
2. Not having changed one's beliefs or opinions.

Origin:

Late 16th century: from un-1 + converted, on the pattern of words such as unrepentant.

Examples:

1. The unconverted data could not be used by the program.
2. He remained unconverted to the new ideas despite much discussion.
3. The building remained unconverted and unused for many years.
4. She remained unconverted from her previous religious beliefs.
5. The unconverted files could not be opened in the new software.