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