An eccentric person is someone who behaves in an unconventional or odd manner. This term can be used to describe a variety of people, from the 6-letter 'WEIRDO' to the 8-letter 'CRACKPOT, ' the 7-letter 'ODDBALL, ' the 4-letter 'KOOK, ' the 9-letter 'SCREWBALL, ' the 5-letter 'CRANK, ' the 9-letter 'FRUITCAKE, ' the 4-letter 'CARD, ' the 6-letter 'MISFIT, ' the 7-letter 'DINGBAT, ' the 3-letter 'NUT, ' and the 5-letter 'CREEP.' All of these terms refer to someone who is considered to be strange or unusual in their behavior.