Abstruse- difficult to understand.

Obscure- kind of an exclusive understanding of something that only a select few know about.

Reciprocate- Answering an action with a similar one.

Intricate- very complicated, detailed

Rudimentary- basic, the simplest of whatever

Disingenuous- not candid or sincere, typically by pretending that one knows less about something than one really does.

Discombobulate- confuse

Inextricable- dependently connected to something