Enter a clue or pattern or both:
The Clue
Profound; abstruse (9 letter answer)
The Answer
RECONDITE
Tags
Notes
The answer RECONDITE is so rare that it appears less than once every 2500 puzzles.
Definition
RECONDITE as an adjective:
1. (abstruse, deep, recondite) = difficult to penetrate; incomprehensible to one of ordinary understanding or knowledge; "the professor's lectures were so abstruse that students tended to avoid them"; "a deep metaphysical theory"; "some recondite problem in historiography"