1. most morally low or despicable; most lacking in honor or dignity
Usage: superlative form of ‘base’
2. of the lowest quality or value; most inferior
Usage: superlative form of ‘base’

Examples

• His betrayal of his closest friend was the basest act imaginable.
• She appealed to the basest instincts of the crowd with her inflammatory speech.
• The politician’s basest motives were exposed in the scandal.
• Even in his basest moments, he retained some sense of right and wrong.
• The basest metals were rejected for the jewelry project.
• They used the basest materials available, resulting in poor construction.