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The aging effect and the metastable ferroelectric state are investigated in the Ba4Eu2(Ti0.9Zr0.1)4Ta6O30 ceramic, where the tetragonal tungsten bronze structure with a P4bm space group is confirmed. When the compound is cooled from temperatures far above its transition temperature (TC), a very slim polarization-electric field curve is observed at 300 K. After 3 days of aging at 300 K, an obvious increase in the remanent polarization and the coercive electric field can be obtained. Moreover, a gradual recovery of the endothermic peak is detected in the differential scanning calorimeter curves when the compound is cooled from temperatures above TC and aged at 300 K for several days. These phenomena are interpreted as the result of a metastable ferroelectric state and the related aging effect, which may be deeply concerned with the compositional inhomogeneity and the hindered superstructure transformation. Through manipulating A and B site cation substitutions, the range of the metastable ferroelectric state can be tuned, and compounds with a different ferroelectric transition process can be obtained. [ABSTRACT FROM AUTHOR]