Today I'm going to teach you three pairs of confusing words that have the prefix IN-. In many words, IN- means the opposite or "not": independent = NOT dependent incorrect = NOT correct However, there are some exceptions that might be confusing, and you'll learn three of them in this lesson: invaluable, infamous, and inflammable. I hope this lesson has helped clarify the meanings of these confusing words. The English language has a lot of words that seem similar, but are actually different - and many English learners make mistakes with them. That's why I wrote the e-book 600+ Confusing English Words Explained - to help you understand these words clearly, so you can use them confidently! What will you learn in this e-book? Click here to see the full list of confusing words in the book.