There are numerous synonyms for the phrase "fastened together," which all refer to two or more things being joined or connected in a secure manner. Some examples of synonyms for "fastened together" include bound, linked, attached, connected, coupled, secured, affixed, and joined. These terms can be used to describe a wide variety of objects and materials, from fabrics and papers to metals and plastics. Whether it's a pair of shoes being tied or a piece of furniture being assembled, the act of fastening things together is an essential part of many everyday activities. Choosing the right synonym can add clarity and precision to your writing and communication.