abstruse

Conceptual is a related term of abstruse.

As adjectives the difference between conceptual and abstruse

is that conceptual is of, or relating to concepts or mental conception; existing in the imagination while abstruse is (obsolete) concealed or hidden out of the way; secret .

As adjectives the difference between theoretic and abstruse

is that theoretic is concerned with theories or hypotheses rather than with practical matters while abstruse is concealed or hidden out of the way; secret.

As an adjective abstruse is

(obsolete) concealed or hidden out of the way; secret .

In obsolete terms the difference between abstruse and transcendental

is that abstruse is concealed or hidden out of the way; secret while transcendental is a transcendentalist.

As a noun transcendental is

a transcendentalist.

As adjectives the difference between theoretical and abstruse

is that theoretical is of or relating to theory; abstract; not empirical while abstruse is concealed or hidden out of the way; secret.

Mystifying is a related term of abstruse.

As adjectives the difference between mystifying and abstruse

is that mystifying is unusual while abstruse is (obsolete) concealed or hidden out of the way; secret .

As a verb mystifying

is .

Subtle is a related term of abstruse.

As adjectives the difference between subtle and abstruse

is that subtle is hard to grasp; not obvious or easily understood; barely noticeable while abstruse is (obsolete) concealed or hidden out of the way; secret .

Imaginary is a related term of abstruse.

As adjectives the difference between imaginary and abstruse

is that imaginary is existing only in the imagination while abstruse is (obsolete) concealed or hidden out of the way; secret .

As a noun imaginary

is imagination; fancy.

Unsolvable is a related term of abstruse.

As adjectives the difference between unsolvable and abstruse

is that unsolvable is not solvable while abstruse is (obsolete) concealed or hidden out of the way; secret .

Abstruse is a related term of puzzling.

As adjectives the difference between abstruse and puzzling

is that abstruse is (obsolete) concealed or hidden out of the way; secret while puzzling is difficult to understand or explain; enigmatic or confusing; perplexing.

As a verb puzzling is

.

As a noun puzzling is

time spent pondering something confusing.