Related Clues:

• Lacking consistency
• Changeable
• Somewhat off
• Eyebrow-raising
• Like a sock without a mate
• Like half of all integers
• OutrГ©
• Not matching
• A bit off
• Rambling
• Far from conventional
• Like all but one prime number
• Like most primes
• Sort of peculiar
• "Hmm. . ."