Theorethische
Theorethische is not a standard entry in contemporary German or English dictionaries and is generally considered a misspelling or an archaic variant of the German word the theoretische or the adjective theoretically. In most modern contexts, the correct forms are theoretisch (theoretical) and theoretische (theoretical, feminine or plural).
Etymology and background: The form would be built from the noun Theorie (theory) and the adjective suffix
Usage and interpretation: If encountered today, the most likely explanation is a misspelling, OCR error, or