thorny
US /ˈθɔːr.ni/
UK /ˈθɔːr.ni/

1.
2.
heikel, schwierig, kompliziert
causing difficulties or disagreements; complex and difficult to deal with
:
•
The negotiations faced many thorny issues.
Die Verhandlungen standen vor vielen heiklen Fragen.
•
It was a thorny problem that required careful consideration.
Es war ein heikles Problem, das sorgfältige Überlegung erforderte.