1. of interior curvature or hollow.   concave   congruent   congenital   discrete   Hint Half-n-half Clue   2. concerned with nutrition.   heterogenous   impervious   alimentary   cosmic   Half-n-half Clue   3. based on experiment, not theory.   cerebral   chronic   anomalous   empirical   Half-n-half Clue   4. can float; light or cheerful.   deducible   graduated   buoyant   inverse   Half-n-half Clue   5. inferred by reasoning; derived as conclusions.   dorsal   abstract   horticultural   deducible   Half-n-half Clue   6. pertaining to the stars or spiritual.   buoyant   fundamental   astral   congruent   Half-n-half Clue   7. implied but not expressed.   implicit   inductive   combustible   contiguous   Half-n-half Clue