1. INTERVENE   become weak or speak hesitantly   come between   deny   understand   Hint Half-n-half Clue   2. IMPLEMENT   stay for long time   understand   put into effect   attribute to someone   Half-n-half Clue   3. LANGUISH   provoke   ridicule   lose vitality   stir up   Half-n-half Clue   4. IMPUTE   attribute to someone   grieve   hinder   deny   Half-n-half Clue   5. INSTIGATE   grieve   reverse   put into effect   provoke   Half-n-half Clue   6. IMPEDE   lose vitality   stay for long time   persuade   hinder   Half-n-half Clue   7. INVERT   come between   understand   reverse   ridicule   Half-n-half Clue