An eccentric sort is someone who is considered to be strange or unusual. GEEZER is a slang term for an elderly person, usually one who is eccentric. KOOK is another slang term for someone who is considered to be odd or strange. ODDBALL is a term used to describe someone who is different from the norm. CHARACTER is a term used to describe someone who has a unique personality. CRANK is a slang term for someone who is considered to be eccentric or odd. All of these terms are used to describe someone who is considered to be an eccentric sort.