abstrusest

Adjective

abstruse (comparative abstruser or more abstruse, superlative abstrusest or most abstruse)

1. (formal) Difficult to comprehend or understand; obscure.
   • Some time the good makithe an ile end⸝ ãd the ile a godd. In this opiniõ⸝ and in ſcrutable miſterie be werithe all his wittes⸝ and at the end of his cogitacions⸝ fyndithe more abſtruſe⸝ and doutfull obiections thẽ at the beginning⸝ […][1548], Joanne Hopper [i.e., John Hooper], “Curiositie”, in A Declaration of the Ten Holy Cõmaundementes of Allmygthye God […], [Zurich]: [Christoph Froschauer], →OCLC, page CCXVIII

   Synonyms:

   abstrusive, arcane, cryptic, esoteric, recondite, Chinese, dense, enigmatic, fathomless, bottomless

   Antonyms:

   clear, obvious, understandable, apprehensible, limpid, comprehensible, explainable, explicable, explicatable, fathomable

2. (formal, obsolete) Concealed or hidden; secret.
   • O vvho is he that could carrie nevves to our olde father, that thou vvert but aliue, although thou vvert hidden in the moſt abſtruſe dungeons of Barbarie; for his riches, my brothers and mine vvould fetch thee from thence.1612, [Miguel de Cervantes], “Which Speakes of that which after Befell in the Inne; and of Sundry Other Things Worthy to be Knowne”, in Thomas Shelton, transl., The History of the Valorous and Wittie...

   Synonyms:

   abstrused, clandestine, surreptitious, behind the scenes, catlike, backroom, backstairs, stealth, cloak-and-dagger, concealed

   Antonyms:

   open, patent, unconcealed, unhidden