1. dissolvable (in solvent) or solvable (of problem).   soluble   resilient   noxious   viscid   Hint Half-n-half Clue   2. used as preventive for spread of disease.   lunar   prophylactic   ventral   malleable   Half-n-half Clue   3. pertaining to earthquakes.   viscous   resonant   seismic   oblique   Half-n-half Clue   4. penetrable or allowing fluids to pass through.   saccharine   temporal   precipitate   permeable   Half-n-half Clue   5. pertaining to poison.   visceral   pulmonary   tertiary   toxic   Half-n-half Clue   6. pertaining to the body or physical.   somatic   seismic   precise   tensile   Half-n-half Clue   7. echoing or resounding.   opaque   theoretical   mnemonic   resonant   Half-n-half Clue