"Mattered" is a very versatile word that can be used to express a wide range of emotions such as importance, relevance, and significance. It is a word that is commonly used in everyday speech and writing to describe something that is of great value or significance. Some synonyms for the word "mattered" include: was significant, meant something, had weight, was relevant, had importance, had significance, was crucial, had value, made a difference, was essential, was indispensable, was material, was of consequence, and was of import. These synonyms can help to add variety and nuance to your writing, allowing you to convey your thoughts and ideas in a more effective and impactful way.