The Collaborative International Dictionary
Hyperthetical
Hyperthetical \Hy`per*thet"ic*al\, a. [Gr. ?; "ype`r over + tiqe`nai to place.] Exaggerated; excessive; hyperbolical. [Obs.]
Hyperthetical or superlative . . . expression.
--Chapman.
Wiktionary
hyperthetical
a. (misspelling of hypothetical English)