The phrase "haddest weight" refers to something that has a lot of significance or importance. Synonyms for this phrase might include terms like "had great significance," "carried much weight," or "was of utmost importance." Other synonyms might include phrases like "had considerable impact," "held significant meaning," or "was of great consequence." These types of synonyms all convey the idea that something is so important that it cannot be ignored or dismissed easily, and that it has a profound impact on the situation or person in question. Whether talking about personal relationships, political debates, or business matters, having "haddest weight" is always important.