| A | B |
| rebuild | to build again |
| unknown | not known |
| disagree | the opposite of agree |
| indefinite | not definite |
| unusual | not usual or common |
| dislike | to have a feeling of not liking |
| pretest | a test given before the real test |
| disappear | to stop being seen; vanish |
| rewind | to wind again |
| recycle | to put something through a special process so that it can be used again |
| incorrect | not correct or true |
| prefix | a syllable or group of syllables that is joined at the beginning of a word to change the word's meaning |
| unlucky | not lucky |
| return | to go back or come back |
| preview | to view or show ahead of time |
| inexpensive | not expensive; low in price |
| unhealthy | not healthy; not well; having poor health |
| disconnect | to break or undo the connection of |
| refinish | to take something old and make new again |
| prepay | to pay for ahead of time |