iffy (n.)
iffy (adj.)
- accidental
 - adventitious
 - aleatory
 - arguable
 - capricious
 - casual
 - causeless
 - chance
 - chancy
 - confutable
 - conjectural
 - contestable
 - contingent
 - controversial
 - controvertible
 - debatable
 - deniable
 - dicey
 - disputable
 - doubtable
 - doubtful
 - dubious
 - dubitable
 - erratic
 - fatal
 - fluky
 - fortuitous
 - incalculable
 - incidental
 - indeterminate
 - mistakable
 - moot
 - problematic
 - questionable
 - refutable
 - risky
 - speculative
 - suppositional
 - suspect
 - suspicious
 - uncaused
 - undetermined
 - unexpected
 - unforeseeable
 - unforeseen
 - unlooked-for
 - unpredictable
 - whimsical