1. pertaining to the earth.   terrestrial   serrated   spatial   precise   Hint Half-n-half Clue   2. echoing or resounding.   seminal   resonant   tautological   viscous   Half-n-half Clue   3. of the third kind.   refractory   tertiary   rarefied   mnemonic   Half-n-half Clue   4. between one and two right angles; blunt or dull.   lunar   resilient   stagnant   obtuse   Half-n-half Clue   5. slanting or indirect.   tensile   refractory   oblique   potable   Half-n-half Clue   6. pertaining to the abdomen.   multiform   stellar   ventral   partial   Half-n-half Clue   7. sound or logically convincing.   lunar   sidereal   valid   volatile   Half-n-half Clue