Answer:

recondite

Answer	Crossword Clue
RECONDITE	Little-known
RECONDITE	Hard to understand.
RECONDITE	Abstruse.

RECONDITE	Obscure.
RECONDITE	Profound; abstruse

Crossword

a puzzle consisting of a grid of squares and blanks into which words crossing vertically and horizontally are written according to clues.