intrigante (problema, interessar)

difficile (a) (problema)

délicat (a) (problema)

épineux (a) (problema)

difficile à comprendre (a) (problema)

compliqué (a) (problema)

complexe (a) [m.] (problema)

fascinant (a) (interessar)

intrigant (a) (interessar)

difficile (a) (problema)

intrigante (a) [m.] (interessar)

delicato (a) (problema)

complicato (a) (problema)

complesso (a) [m.] (problema)

interessante (a) (interessar)

coinvolgente (a) (interessar)

intriguing (a) (interessar)

fascinating (a) (interessar)

difficult (a) (problema)

hard to understand (a) (problema)

complex (a) (problema)

intricate (a) (problema)

faszinierend (a) (interessar)

schwierig (a) (problema)

diffizil (a) (problema)

kompliziert (a) (problema)

schwer verständlich (a) (problema)

complicado (a) (problema)

delicado (a) (problema)

difícil (a) (problema)

difícil de entender (a) (problema)

espinoso (a) [m.] (problema)

fascinante (a) (interessar)

intrigante (a) [f.] (interessar)

intrincado (a) (problema)

svår (a) (problema)

invecklad (a) (problema)

krånglig (a) (problema)

fängslande (a) [n.] (interessar)

fascinerande (a) (interessar)

kinkig (a) (problema)

knepig (a) (problema)

intrigerend (a) (interessar)

fascinerend (a) (interessar)

boeiend (a) (interessar)

moeilijk (a) (problema)

gecompliceerd (a) (problema)

netelig (a) (problema)

ingewikkeld (a) (problema)

delicaat (a) (problema)