Terms containing difficult to understand

Subject	English	Russian
gen.	difficult to understand	трудный для понимания
math.	is difficult to understand	малопонятный
Gruzovik	difficult to understand	малопонятный
gen.	difficult to understand	неразборчивый (grafleonov)
idiom.	difficult-to-understand code	трудный для понимания код (venturebeat.com Alex_Odeychuk)
progr.	difficult-to-understand code	малопонятный код (venturebeat.com Alex_Odeychuk)
math.	difficult-to-understand problem	не совсем понятная задача
gen.	find it difficult impossible, easy, etc. to understand him	трудно и т.д. понять его (to make her come on time, to remember these figures, etc., и т.д.)
quot.aph.	it is difficult for me to understand	мне трудно понять (Alex_Odeychuk)
math.	it is not difficult to understand	нетрудно понять (how, what, that, etc.)
quot.aph.	it is very difficult for me to understand	мне крайне сложно понять (Alex_Odeychuk)
quot.aph.	it is very difficult for me to understand	мне очень трудно понять (Alex_Odeychuk)
Makarov.	she finds it difficult to understand her	ей трудно понять её