en_tn/jer/05/21.md

who have no understanding

"who do not understand" or "who understand nothing"

you cannot see

Here "cannot see" is a metonym for not understanding. Alternate translation: "you do not understand" (See: rc://en/ta/man/translate/figs-metonymy)

you cannot hear

Here "cannot hear" represents not understanding. "Alternate translation: "you do not understand" (See: rc://en/ta/man/translate/figs-metonymy)