1. Impossible to find
   "the book is practically introuvable"

See also: absent

• improbability
• improbable
• improbableness
• improbably
• improbity
• impromptu
• improper
• improper fraction
• improperly
• improperness
• impropriety
• improv
• improvability
• improvable
• improve
• improved
• improvement
• improver
• improvidence
• improvident
• improvidently
• improving
• improvisation
• improvisational
• improvisatory