1. RAUCOUS   concise and expressive   obdurate   loud and harsh   deep   Hint Half-n-half Clue   2. PERFIDIOUS   unimaginative   advanced in development   sounding impressive   disloyal   Half-n-half Clue   3. PRECARIOUS   superficial   widespread   unsafe   whining   Half-n-half Clue   4. PREVALENT   widespread   obdurate   loud and harsh   practical   Half-n-half Clue   5. PONDEROUS   unwieldy   elaborately ornamented   inflammatory   sturdy   Half-n-half Clue   6. PERFUNCTORY   impudently taking liberty   threatening   impossible to see through   superficial   Half-n-half Clue   7. RELEVANT   superficial   restricted   sturdy   pertinent   Half-n-half Clue