The expression "more tomboyish" can be replaced with several other synonyms. Some possible options include: boyish, masculine, rough-and-tumble, sporty, rugged, or unfeminine. Each of these terms describes a certain aspect of a person or behavior that is associated with the traditional stereotype of a tomboy. Some of these synonyms may be more appropriate for certain situations than others, depending on context and tone. For example, "boyish" may sound more playful or casual, while "masculine" may have stronger connotations of gender roles and stereotypes. Ultimately, the choice of synonym will depend on the desired effect and audience.