recondite
US /ˈrek.ən.daɪt/
UK /ˈrek.ən.daɪt/

1.
recondito, profondo, astruso
dealing with very profound, difficult, or abstruse subject matter
:
•
He was known for his recondite knowledge of ancient languages.
Era noto per la sua conoscenza recondita delle lingue antiche.
•
The professor's lecture was full of recondite theories.
La lezione del professore era piena di teorie recondite.
2.
poco noto, oscuro
little known; obscure
:
•
The book contained many recondite facts about medieval history.
Il libro conteneva molti fatti poco noti sulla storia medievale.
•
His research delved into recondite areas of quantum physics.
La sua ricerca si è addentrata in aree recondite della fisica quantistica.