Final answer:
To replace 'dude' with a more formal word, one might use 'gentleman', 'sir', 'individual', or 'person'. The choice depends on the level of formality and inclusivity desired. Language use is adapting to be more gender-neutral and respectful.
Step-by-step explanation:
Words that could replace the informal term 'dude' into a more formal context include 'gentleman', 'sir', 'individual', and 'person'. The word 'gentleman' implies not only gender but also a sense of courtesy and respectability, and it would serve as a suitable replacement in formal contexts. 'Sir' is often used as a polite address to a man in a formal or official situation. 'Individual' is a gender-neutral term that emphasizes singularity without implying any level of formality. 'Person' is also gender-neutral and can be used more broadly in various contexts.
It is important to note that the English language is evolving towards inclusivity and the use of gender-neutral language. The movement to neutralize gender in everyday language includes the use of pronouns like 'they/them' in place of gender-specific pronouns when the gender of the subject is unspecified or inclusive of all genders.
Considering the context of the sentence and the formality required, any of these terms can be substituted for 'dude' to make the language more formal and inclusive.