1. DERIVATIVE   differing   irrelevant   learned   lacking originality   Hint Half-n-half Clue   2. EXHAUSTIVE   skeptical   underhand   guilt-diminishing   thorough   Half-n-half Clue   3. EBULLIENT   advantageous   in high spirits   full of enthusiasm   lively   Half-n-half Clue   4. DEVIOUS   opinionated   underhand   learned   puzzling   Half-n-half Clue   5. FALLACIOUS   inharmonious   misleading   irrelevant   intended only for chosen few   Half-n-half Clue   6. CORDIAL   heartfelt   casual   stated plainly   thin   Half-n-half Clue   7. CORRUGATED   deserving blame   ridged   dejected   spread widely   Half-n-half Clue