1. retro as in retrospective   against   backward   all, whole   far, distant   Hint Half-n-half Clue   2. intra as in intravenous   within   backward   far, distant   back, again   Half-n-half Clue   3. re as in recant   after   new   back, again   within   Half-n-half Clue   4. per as in perennial   new   far, distant   after   through, complete   Half-n-half Clue   5. ob as in obloquy   all, whole   far, distant   through, complete   against   Half-n-half Clue   6. syn as in synthesis   after   above, over   backward   with, together   Half-n-half Clue   7. para as in paragon   related, beyond   new   far, distant   within   Half-n-half Clue