abstruse: [16] It is not clear whether English borrowed abstruse from French abstrus(e) or directly from Latin abstrūsus, but the ultimate source is the Latin form. It is the past participle of the verb abstrūdere, literally ‘thrust’ (trūdere) ‘away’ (ab). (Trūdere contributed other derivatives to English, including extrude and intrude, and it is related to threat.) The original, literal meaning of abstruse was ‘concealed’, but the metaphorical ‘obscure’ is just as old in English.
abstruse (adj.)
1590s, from Middle French abstrus (16c.) or directly from Latin abstrusus "hidden, concealed, secret," past participle of abstrudere "conceal," literally "to thrust away," from ab- "away" (see ab-) + trudere "to thrust, push" (see extrusion). Related: Abstrusely; abstruseness.
例文
1. The involved and abstruse passage makes several interpretations possible.
という難解な文字はいくつかの解釈をすることができる。
2.Einstein 's theory of relativity is very abstruse .
アインシュタインの相対性理論は非常にわかりにくい。
3.Without entering into an abstruse point of divinity,one thing is plain.
そして奥深い教義を語らない点で、はっきりしている点がある。
4.Your statement is a bit too abstruse .
あなたの話は理解しにくい.
5.What is the good of a husband who can make abstruse mathematical calculations？