1. impossible or impractical to perform, carry out, or execute

Examples

• The contract contained unperformable obligations that no company could meet.
• Due to budget cuts, many of the proposed reforms became unperformable.
• The gymnast’s injury made certain routines unperformable.
• The court ruled that the agreement was unperformable under current law.
• Weather conditions made the outdoor concert unperformable.
• The software requirements were deemed unperformable with existing technology.