borderline case

from Moby Thesaurus II by Grady Ward, 1.0

38 Moby Thesaurus words for "borderline case":
      aliene, bedlamite, blind bargain, chance, contingency, crackbrain,
      crackpot, dement, demoniac, double contingency, energumen, fanatic,
      flake, fou, gamble, guess, idiot, kook, loon, loony, lunatic,
      madman, maniac, meshuggenah, noncompos, nut, open question,
      phrenetic, piece of guesswork, question, raving lunatic, screwball,
      sight-unseen transaction, toss-up, touch and go, undecided issue,
      wager, weirdo