guessing

/ˈɡɛsɪŋ/
noun
  1. The act or process of forming an opinion or answer without enough information to be certain.
    • There was a lot of guessing about who would win the election.
    • His guessing was surprisingly accurate for someone who knew very little.
    • Guessing is not allowed on this test; you must show your work.
Antonyms
adjective
  1. Involving or characterized by guesswork; not based on solid facts.
    • Her guessing approach to the puzzle actually worked well.
    • We made a guessing estimate of the crowd size.
    • The report was based on guessing rather than real data.