look up any word, like ratchet:
 
1.
Arcane, not known to many. Rare.

Also Try:
esoteric
Who's the Boss is not a food, Lois
by larstait October 13, 2003
 
2.
adv.

difficult to comprehend
Heinrich: I find this algebraic equation very abstruse...

Jiminy: Very funny Heinrich. Our teacher went through that type of equation this whole week!
by King of Inland December 29, 2007
 
3.
Sibling to recondite
Dunno what that fucker means!
-Oh, so he is difficult to understand?
AbsoFuckinLutely!
by zagnut February 21, 2005