ABSTRUSEST
Adjective
abstrusest
(rare) superlative form of abstruse: most abstruse
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Source: Wiktionary
ABSTRUSE
Ab*struse", a. Etym: [L. abstrusus, p. p. of abstrudere to thrust
away, conceal; ab, abs + trudere to thrust; cf. F. abstrus. See
Threat.]
1. Concealed or hidden out of the way. [Obs.]
The eternal eye whose sight discerns Abstrusest thoughts. Milton.
2. Remote from apprehension; difficult to be comprehended or
understood; recondite; as, abstruse learning.
Profound and abstruse topics. Milman.
Source: Webster’s Unabridged Dictionary 1913 Edition