What words do you use to describe an unmatched couple? [closed]

• Mismatched
  To match unsuitably or inaccurately.
• She is out of my league
  the subtitle of the ominous film actually says: "How can a 10 go for a five?"
• She is a 9 and he's a 4 but the numerical difference is somewhat ameliorated if the man in question is extremely wealthy. Think Anna Nicole Smith, the 26-year-old model who married the 89-year-old James Howard Marshall II

"She was gorgeous. He must have been funny."

I think the most polite and descriptive way to say this is odd couple as in "they are an odd couple, aren't they?".

People know this phrase from the TV show of the same name which described two roommates who were incompatible in ways that led to amusing conflicts.