There is a curse in Shanghainese: "Ling Du is ineffective". What does it mean in Mandarin?

"Ling Du is ineffective" can't all be regarded as swearing words. This sentence means: not very good. Different occasions have different understandings.

To say that someone is "ineffective" means that this person is not decent, unruly and not very good;

To say that a patient is "ineffective" means that the patient's condition is not good and is developing in a bad direction;

To say that an item is "invalid" means that the quality of the item as a whole is not very good;

To say that something is "invalid" means that going on will not have a good result; For example, the entity of the pile is invalid. This will not be very good.

There is also a saying that "Ling Du is invalid", which means there is nothing good. For example, the entity of the pile is invalid. This thing will not be very good in most cases.