1. RUBBLE   unbroken stone   impervious rock   pertinent question   impenetrable fortress   fragmented brick   Hint Hint       2. PUERILE   frugal   adult   fertile   frantic   audacious   Hint       3. SALVAGE   vitiate   douse   lose   unite   civilized   Hint       4. ROBUST   ravenous   weak   wary   rancid   wanton   Hint       5. RUEFUL   satisfied   original   pompous   rare   satirical   Hint       6. SANCTIMONIOUS   empirical   maudlin   devout   theoretical   impious   Hint       7. SALLOW   genuine   wan   ruddy   maximum   deep   Hint