The term "mannishly" can be replaced with a variety of synonyms, each with their own specific connotations and implications. For a similar meaning, words like "masculinely," "virilely," and "manlike" could be used. However, these words can also carry negative connotations of toxic masculinity. Other synonyms such as "sturdily," "robustly," and "resolutely" capture the strong and sturdy aspects of masculinity without implying negative traits. Alternatively, words like "boldly," "confidently," or "assertively" could convey the idea of exhibiting traditionally masculine traits like leadership and dominance without limiting the definition of what it means to be a man.