Some antonyms can be formed by adding prefixes. Form antonyms of the following words by adding prefixes (such as un-, in- and dis- ). Example: impressed — unimpressed competent — incompetent 1. sympathetic _____________ 2. justified _____________ 3. advantage _____________ 4. imaginative _____________ 5. familiar _____________ 6. alcoholic _____________ 7. obey _____________ 8. convenient _____________ 9. practical _____________ 10. ability _____________