Definitions:

1. especially of promises or contracts, not violated or disregarded adjective
   • My word remains unbroken.
2. marked by continuous or uninterrupted extension in space or time or sequence adjective
   • cars in an unbroken procession
3. not subdued or trained for service or use adjective
   • unbroken colts

Synonyms:

• kept
• unploughed
• unplowed