However is a word that signals a contrast or exception to what was just said. When you write “I studied hard for the test; however, I still found it challenging,” you're showing that the second part goes against what you might expect from the first part.

The word works like a verbal pivot point. If someone says “The weather forecast predicted rain; however, the sun shone all day,” that however alerts you that reality didn't match the prediction. In conversation, you might say “I wanted to go to the park. However, I had too much homework.”

Writers use however to make their thinking more sophisticated. Instead of just listing facts, they show how ideas push against each other. “The experiment failed three times; however, we learned something valuable from each attempt” demonstrates persistence despite setbacks.

You can also use however to mean “in whatever way” or “to whatever degree,” as in “However you solve this problem, show your work” or “However hard the puzzle seems, keep trying.” In these cases, it emphasizes that the method or degree doesn't matter.

One usage tip: when however means “but” and connects two complete sentences, it usually needs strong punctuation around it (a semicolon or period before, and a comma after). When it appears in the middle of a sentence, it is usually set off by commas. This helps readers hear that mental pivot in your sentence.