This sarcastically exaggerates the amount of tears the people cry to show that Yahweh knows that the people do not really feel sad. (See: [[rc://en/ta/man/translate/figs-hyperbole]] and [[rc://en/ta/man/translate/figs-irony]])
The words "weeping" and "sighing" share similar meanings and intensify the idea of weeping. Alternate translation: "with great weeping" (See: [[rc://en/ta/man/translate/figs-doublet]])