oddball

• POS: Adjective, Noun
• HYPHEN: odd=ball

CIDE DICTIONARY

oddball, n. 

•  A person with an unusual or odd personality; an eccentric person.  [WordNet 1.5]
•  Anything unusual in its class.  [PJC]

  "Pluto is an oddball among its eight sister planets. It's the smallest in both size and mass, and has the most elliptical orbit. It moves in a plane tilted markedly away from the other planets' orbits. Moreover, Pluto is the only planet made almost entirely of ice."

oddball, a. 

 Eccentric; very unusual; strange; bizarre; as, an oddball request.  [PJC]

OXFORD DICTIONARY

oddball, n. colloq.
1 an odd or eccentric person.
2 (attrib.) strange, bizarre.

THESAURUS

oddball

abnormal, absurd, alien, anomalous, anomaly, bizarre, black sheep, blemish, case, character, crackpot, crank, crankish, cranky, crosspatch, crotchety, curious, deviant, deviative, different, divergent, dotty, duck, eccentric, erratic, exceptional, fanatic, fey, flake, flaky, foreign body, foreign intruder, freak, freaked out, freakish, freaky, funny, hermit, hobo, idiocratic, idiosyncratic, impurity, individualist, inner-directed person, intruder, irregular, kinky, kook, kooky, lone wolf, loner, maggoty, maverick, meshuggenah, misfit, monkey wrench, mote, natural, naysayer, nonconformist, nut, nutty, odd, odd fellow, oddity, off, off the wall, original, out, outlandish, outsider, pariah, passing strange, peculiar, quaint, queer, queer duck, queer fish, queer specimen, quirky, quiz, rara avis, recluse, screwball, screwy, singular, sliver, solitary, speck, splinter, spook, sport, stone, strange, strange duck, tramp, twisted, type, unconventional, unearthly, unnatural, wacky, weed, weird, weirdo, whimsical, wondrous strange, zealot, zombie