| polite | impolite |
| regular | irregular |
| literate | illiterate |
| reversible | irreversible |
| moral | immoral |
| tolerable | intolerable |
| responsible | irresponsible |
| active | inactive |
| 1. | semi-: 'partly' |
| 2. | multi-: 'many (or several)' |
| 3. | anti-: 'opposed to; opposite of; or preventing' |