The word "whyfor" is not often used in modern English and has fallen out of common usage. It is often replaced with the synonymous phrase "reason why." Other synonyms for "whyfor" include "purpose," "motive," and "cause." These words all imply the need to understand the reasoning behind a particular action or event. In casual conversation, the word "why" is commonly used to ask for an explanation or justification for something. People often say, "Why did you do that?" or "Why is that important?" instead of using more archaic language such as "whyfor." In summary, although "whyfor" may have been commonly used in the past, it is now considered outdated and rarely used in modern conversations.