Plasticity is the exact antonym of rigidity, not its complement

Evidence

Meanwhile, plasticity directly contradicts rigidity. It is its exact antonym. In ordinary speech, it designates suppleness, a faculty for adaptation, the ability to evolve. — Catherine Malabou, What Should We Do with Our Brain?, 39

Categorization

• XREF: The ‘suppleness/adaptation’ drift is precisely where flexibility-as-docility hijacks the concept — anticipating Malabou’s later critique that contemporary brain talk collapses plasticity into mere flexibility. — connects to: Plasticity is suppleness that is neither passion nor passivity — Catherine Malabou, The Future of Hegel: Plasticity,…, 290; Plasticity means mobility of character, not rigidity or abstract virtue
• corroborated: 2 independent passages support this claim — Catherine Malabou, What Should We Do with Our Brain?, 39