Related Clues:
- Not clear
- Unpredictable determinant
- Undistinguished one
- Je ne sais quoi
- Hard-to-define influence
- Mystery quality ... or what 18- and 55-Across and 3- and 32-Down have?
- Inconsequential person
- Star's opposite
- Not clearly expressed
- Make less visible
- Unknown one
- Hard-to-define element
- Indistinct or not well-known
- Dim, indistinct or not well known
- Cloudy or indistinct