It'll let you know what the problem is. In your case, the password you chose was considered weak because it contains some words it considers too common. Passwords must have at least a letter and non-letter (number or special character), can be from 8 to 128 characters, can't contain your username, and must pass the common words check unless it is sufficiently long.
Well I highly doubt what I had is any sort of common word and it wasn't part of my username. I mean part of it was a name, and doing a quick wolfram alpha search, is not common at all. I'll play around with it and see if I can get anything to work.