1. rash or hasty.   prehensile   seismic   spatial   precipitate   Hint Half-n-half Clue   2. inert or at rest.   stagnant   quiescent   repellent   valid   Half-n-half Clue   3. pertaining to tension; capable of being stretched.   redundant   optimum   tensile   schematic   Half-n-half Clue   4. stubborn or rebellious.   potable   refractory   omnivorous   permeable   Half-n-half Clue   5. pertaining to glass and its characteristics.   rigid   vitriolic   opaque   vitreous   Half-n-half Clue   6. pertaining to the earth.   translucent   terrestrial   transient   stagnant   Half-n-half Clue   7. unattractive or repulsive.   ventral   obtuse   repellent   nocturnal   Half-n-half Clue