(Translated by https://www.hiragana.jp/)
Theoretical Definition & Meaning | Britannica Dictionary
An Encylopedia Britannica Company

theoretical

1 ENTRIES FOUND:
theoretical θしーたiːjəˈrɛtɪkəl/ adjective
also theoretic θしーたiːjəˈrɛtɪk/
theoretical
θしーたiːjəˈrɛtɪkəl/
adjective
also theoretic θしーたiːjəˈrɛtɪk/
Britannica Dictionary definition of THEORETICAL
: relating to what is possible or imagined rather than to what is known to be true or real
: relating to the general principles or ideas of a subject rather than the practical uses of those ideas

— theoretically

θしーたiːjəˈrɛtɪkli/ adverb