1. boiling or enthusiastic.   Hint First letter clue   2. can catch fire or burn easily.   First letter clue   3. two-year long or every two years.   First letter clue   4. not concentric or odd.   First letter clue   5. uncertain or not fixed   First letter clue   6. implied but not expressed.   First letter clue   7. fragrant or sweet-smelling.   First letter clue