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Adv."],"published-print":{"date-parts":[[2026,5,15]]},"abstract":"<jats:p>Broadband-tunable electromagnetic wave absorption materials are critical for dynamic scenarios, such as those in wireless communication and radar systems. However, conventional absorbers are limited by narrow bandwidth and fixed postfabrication geometries. Herein, we propose a four-dimensional (4D)-printed pyramidal metamaterial comprising a hierarchically porous carbon\u2013supported high-entropy ceramic and a shape memory elastomer. By synergizing macroscopic cavity resonances with microscopic defect-induced polarizations, the metamaterial delivers an absorption bandwidth of 14.16 gigahertz (\u226590% absorption), representing a 98.88% enhancement over its bulk counterpart. In addition, it enables spatial reconfiguration via a moderate thermal stimulus (120\u00b0C), achieving tunable absorption across 5.24 to 18 gigahertz while maintaining reflection loss below \u221220 decibels (\u226599% absorption). The base material\u2019s adaptability to complicated configurations is demonstrated by helical, origami-inspired, and load-bearing architectures. 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