with the best will in the world idiom UK
（用于表示无法做某事）尽管我真心愿意
used to mean "I would like to if I possibly could", in a situation where you cannot do something
With the best will in the world, I can't employ him in the shop unless I can trust him. 除非我能信任他，否则不管我多想，我都不能雇他到店里工作。