The word "yonks" is a British colloquialism that means a long time or ages. There are many synonyms for this word that can be used to describe the same concept. Some of these synonyms include "ages," "eons," "forever," "an eternity," "a lifetime," "a century," "years," and "a millennium." Each of these words evokes a sense of prolonged time, emphasizing the idea that a significant amount of time has passed. Whether you have been waiting for something for yonks or have not seen a friend in yonks, these synonyms can help you express the idea of an extended period in a variety of contexts.