not to care a jot or not to give a jot毫不在乎；毫不在意
I do not care a jot if my doctor is working-class or middle-class, but I do care if he has a shaky knowledge of medicine.我的医生是工人阶级还是中产阶级, 我一点都不在乎, 但他的医学知识是否可靠, 我可是在乎的。
Rain pelted down, but I did not give a jot.大雨滂沱, 但我毫不在意。