əbzˈtrüs, (ˈ)abz|t-, əbˈst-, -ab|st- adjective
( sometimes -er/-est )
Etymology: Latin abstrusus concealed, from past participle of abstrudere to push away, conceal, from abs- (variant of ab- ab- (I)) + trudere to push, thrust — more at threat
1. obsolete : concealed , hidden
the eternal eye whose sight discerns abstrusest thoughts — John Milton
2. : difficult to comprehend or understand : recondite
the abstruse calculations of mathematicians
involved and abstruse language