1. leading to absence of pain.   ebullient   amorphous   analgesic   biennial   Hint Half-n-half Clue   2. wearing away (by chemicals).   igneous   implicit   discrete   corrosive   Half-n-half Clue   3. of motive force or energetic.   dynamic   corrosive   concave   concurrent   Half-n-half Clue   4. irregular or abnormal.   deducible   finite   aseptic   anomalous   Half-n-half Clue   5. shapeless or lacking definition.   homogeneous   anomalous   amorphous   acrid   Half-n-half Clue   6. surgically sterile or preventing infection.   dynamic   congenital   impermeable   aseptic   Half-n-half Clue   7. of the universe; very large.   cosmic   congruent   concurrent   anomalous   Half-n-half Clue