The adverb "inadmissibly" refers to something that cannot be allowed, accepted, or permitted. There are a few synonyms that can be used to express the same meaning, such as "unallowable", "invalid", "unacceptable", "forbidden", "prohibited", "unacceptable", "unjustifiable" and "impermissible." We use inadmissibly when something goes beyond approved conduct or is forbidden by a particular set of rules. For instance, a piece of evidence presented in court might be inadmissible if it was obtained illegally. The use of synonyms in writing helps to enhance both the clarity and richness of the text, making it more engaging and exciting to read.