1. Not provable
   "it was both unproved and unprovable"

See also: unobvious

Encyclopedia: Unprovable

• spaceship
• spacesuit
• spacewalk
• spacewalker
• spaceward
• spacewards
• spacewoman
• spacey
• spacial
• spacing
• spaciotemporal
• spacious
• spaciously
• spaciousness
• spackle
• spackling compound
• spacy
• spade
• spade bit
• spade casino
• spade-like
• spade-shaped
• spadefish
• spadefoot
• spadefoot toad