- трудновыполнимый
- Трудновыполнимый - arduous, exacting; demanding (о требовании, условии)
These requirements are more arduous than might appear at first sight.The conditions for subsequent gaseous growth, once the vapor bubble has become fixed on the body, are somewhat more demanding.
Русско-английский научно-технический словарь переводчика. 2013.