Recondite:
1 : difficult or impossible for one of ordinary understanding or knowledge to comprehend : deep a recondite subject
2 : of, relating to, or dealing with something little known or obscure
recondite fact about the origin of the holiday — Floyd Dell3 : hidden from sight : concealed
Noted in “Odds on: 10 science breakthroughs you can bet on,” Michael Brooks, NewScientist (13 May 2017, paywall):
Alien contact at least has a protocol: it must be confirmed by the US President or UK Prime Minister. Policing more recondite bets can be tough, though. “Say we were to take a bet on there being more to evolution than genetics,” says Sharpe. “Who’s going to chair that debate?”
