Crossword Heaven

Answer: XFACTOR

XFACTOR is a crossword puzzle answer that we have spotted 15 times.

• Unknown element
• Unknown
• Hard-to-define influence
• Unknown influence
• Its effect is hard to predict
• Mystery quality ... or what 18- and 55-Across and 3- and 32-Down have?
• Unpredictable determinant
• Unpredictable element
• Hard-to-define element
• Nebulous element
• Strongly influential quality
• Hard-to-define quality
• Intangible quality responsible for four puzzle answers
• Je ne sais quoi
• Certain something