1. two, twice   bi as in bipartite   micro as in microcosm   ultra as in ultrasonic   contra as in contravene   Hint Half-n-half Clue   2. one, single   mono as in monotheism   bi as in bipartite   proto as in prototype   poly as in polyglot   Half-n-half Clue   3. against   poly as in polyglot   pre as in preamble   contra as in contravene   under as in undercurrent   Half-n-half Clue   4. among, between   ultra as in ultrasonic   inter as in intervene   co as in coalesce   meta as in metamorphosis   Half-n-half Clue   5. without   mono as in monotheism   mis as in misanthrope   inter as in intervene   an as in anarchic   Half-n-half Clue   6. down   co as in coalesce   under as in undercurrent   cata as in cataclysm   circum as in circumspection   Half-n-half Clue   7. hatred   mis as in misanthrope   mega as in megalith   ultra as in ultrasonic   contra as in contravene   Half-n-half Clue