1. impervious or unpassable.   integral   carnivorous   impermeable   inevitable   Hint Half-n-half Clue   2. wearing away (by chemicals).   diffuse   brittle   anthropomorphic   corrosive   Half-n-half Clue   3. resembling man or man-like.   anthropoid   incandescent   convex   empirical   Half-n-half Clue   4. large or extensive like the heavenly bodies.   ductile   astronomical   inevitable   cognitive   Half-n-half Clue   5. practicable or possible.   deducible   cerebral   determinate   feasible   Half-n-half Clue   6. necessary for the whole; complete, not fractional.   integral   asymmetric   herbivorous   contiguous   Half-n-half Clue   7. can float; light or cheerful.   buoyant   aseptic   astral   astronomical   Half-n-half Clue