The German words "wieso," "weshalb," and "warum" all translate to "why" in English but have slightly different nuances and usage contexts.

• [wieso](javascript:void(0)) can be understood as "how come" or "how is that so?" It often implies asking for the cause or the way something happened. It is more colloquial and less formal, commonly used in everyday speech rather than official or scientific contexts.
• [weshalb](javascript:void(0)) is somewhat antiquated or formal and roughly means "for what reason" or "for what purpose." It is less commonly used nowadays and can appear somewhat old-fashioned.
• [warum](javascript:void(0)) is the most straightforward and neutral term for "why." It is widely used in all types of contexts and simply asks for the reason or cause.

While "wieso" suggests a sense of "how" or the manner of something, "warum" is a direct "why," and "weshalb" leans toward a purpose or reason, often feeling a bit more formal or literary. These subtle distinctions affect when and how each word is used in conversation and writing.