1. to make something impure, inferior, or corrupted by mixing it with inferior elements
Usage: British spelling (American: bastardizes); formal or literary
2. to declare or prove to be illegitimate
Usage: archaic or legal; British spelling (American: bastardizes)

Examples

• The director felt that the remake bastardises the original novel.
• Excessive commercialization bastardises the authentic spirit of the festival.
• Adding artificial flavors bastardises the purity of traditional recipes.
• The adaptation bastardises Shakespeare's language with modern slang.
• Some critics argue that the sequel bastardises the franchise's core values.