irreplaceable
/ˌɪɹ.əˈpleɪ.sə.bəl/ adjective B2- Incapable of being replaced, especially because of uniqueness or finiteness. · irreplaceable batteries· irreplaceable family portrait
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However, her most consequential role manifested in her capacity as an irreplaceable linguistic intermediary between the explorers and the numerous indigenous communities they encountered.
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