Synonyms:
guess, guesswork, guessing, shot, dead_reckoning
Meaning: an estimate based on little or no information
Usage examples
An intolerable deal of guesswork
"We are coming now rather into the region of guesswork," said Dr. Mortimer.
She sucked her thumb for a moment (this is guesswork), and sat down to her amazing tale.
The only things which go any way towards an explanation of it are but guesswork, and I give them more because I would not conceal anything, than because I think they are of any worth.