The term "yakketied yak" is an informal expression that refers to excessive talking or chattering. The word "yak" itself has several antonyms that can be used to convey the opposite meaning. Some of the antonyms for "yak" include "listen," "hush," "quiet," "shut up," and "be silent." These words imply a sense of peace, tranquility, and restraint, rather than constant chatter. If you wish to describe someone who is reserved or quiet, you could use words such as "introverted," "timid," "withdrawn," or "reticent." On the other hand, a more outspoken or extroverted person could be described as "talkative," "sociable," "garrulous," or "loquacious.