The spelling of the word "scientifical" is incorrect; the correct form is "scientific." In IPA phonetic transcription, the pronunciation of "scientific" is /ˌsaɪənˈtɪfɪk/. The addition of -al at the end of the word creates an adjectival form, but in this case, it results in a non-standard and non-accepted word. It's essential to use the correct spelling and pronunciation of words to accurately convey meaning and avoid confusion.
According to science; producing or containing certain knowledge.
Etymological and pronouncing dictionary of the English language. By Stormonth, James, Phelp, P. H. Published 1874.