The term "seethrough" can be defined as the quality of being transparent or easily seen through. There are several synonyms that can be used to describe something that is seethrough, including transparent, clear, see-through, sheer, and diaphanous. These words can be used to describe a variety of things, from clothing and textiles to glass and other materials. Additionally, these synonyms can be used to describe a person or situation that is easily understood or perceived, as in the phrase "I can see right through his lies." Overall, the use of synonyms for "seethrough" can add variety and depth to descriptions and storytelling.