The word "coyishnesses" is quite rare, and it can be difficult to find synonyms that have the same meaning. Coyishnesses refers to someone or something that is shy or reluctant, especially in a flirtatious or playful way. Some potential synonyms for this word might include coyness, shyness, bashfulness, timidity, reserve, hesitance, or hesitancy. Additionally, words like demure, flirtatious, or playful might also be considered synonyms, depending on the context in which they are used. Regardless of which word is chosen, it's important to pay attention to the subtle differences in meaning between these similar terms.