retruse
adjEtymology From Latin retrusus (“concealed”), past participle of retrudere.
1
Thrust backward; retruding.
2
Obsolete abstruse
- 1662, Henry More, Preface to A Collection of Several Philosophical Writings I have a sense of something in me while I thus speak, which I must confess is of so retruse a nature that I want a name for it, unless I should adventure to term it