1. PERSPICUITY   sharp intellect   rage   antipathy   vagueness   complexity   Hint Half-n-half Clue   2. PERMEABLE   aggravating   ending   impervious   agreeable   unpermitted   Half-n-half Clue   3. HAPLESS   brilliant   cheerful   unlucky   clueless   fortunate   Half-n-half Clue   4. LANGUOR   foolish   vitality   monkey-around   scholarly   serious   Half-n-half Clue   5. PERNICIOUS   harmless   audacious   tangible   priceless   very dear   Half-n-half Clue   6. HETEROGENEOUS   homogeneous   tolerant   igneous   paean   unique   Half-n-half Clue   7. PRECIPITATE   safe   condensate   aggravate   dangerous   cautious   Half-n-half Clue