1. pertaining to earthquakes.   random   spatial   sidereal   seismic   Hint Half-n-half Clue   2. supefluous or excessive.   redundant   precise   molten   metallurgical   Half-n-half Clue   3. corrosive as acid or sarcastic.   ovoid   opalescent   refractory   vitriolic   Half-n-half Clue   4. pertaining to the sense of touch.   stagnant   tactile   iridescent   partial   Half-n-half Clue   5. pertaining to sugar or sweet.   ligneous   saccharine   monochromatic   transparent   Half-n-half Clue   6. pertaining to motion.   mnemonic   pungent   kinetic   soluble   Half-n-half Clue   7. having the nature of wood.   iridescent   septic   ligneous   stratified   Half-n-half Clue