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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)