1. not able to penetrate or understand.   impenetrable   horticultural   implicit   elliptical   Hint Half-n-half Clue   2. produced by fire or volcanic action.   hypothetical   chronic   igneous   abrasive   Half-n-half Clue   3. that corrodes or burns; biting or sarcastic.   corrosive   caustic   asymmetric   empirical   Half-n-half Clue   4. capable of being drawn into wire or flexible.   finite   ductile   concentric   asymmetric   Half-n-half Clue   5. resembling man or man-like.   hybrid   amorphous   anthropoid   impermeable   Half-n-half Clue   6. corresponding or in harmony.   acrid   dyspeptic   deciduous   congruent   Half-n-half Clue   7. inferred by reasoning; derived as conclusions.   heterodox   congenital   aromatic   deducible   Half-n-half Clue