1. hybrid   not conventional.   cross-bred or mongrel.   heat-liberating.   irregular or abnormal.   Hint Half-n-half Clue   2. impervious   arranged in gradations (e.g., of difficulty).   existing from birth.   impenetrable or unpassable.   occurring at the same time.   Half-n-half Clue   3. implicit   implied but not expressed.   sealed by fusion to be air-tight.   characteristic of a genus; not specific.   secure or resistant to.   Half-n-half Clue   4. biennial   large or extensive like the heavenly bodies.   surgically sterile or preventing infection.   two-year long or every two years.   breakable or fragile.   Half-n-half Clue   5. contiguous   herb-eating or vegetarian.   cold like ice.   having common center.   next to or adjoining.   Half-n-half Clue   6. diffuse   impenetrable or unpassable.   spread around like a gas; verbose.   secure or resistant to.   imbalanced or not similar about dividing line.   Half-n-half Clue   7. generic   related to embryo or undeveloped.   characteristic of a genus; not specific.   practicable or possible.   heat-liberating.   Half-n-half Clue