guesswork[noun]Synonyms: speculation, conjecture, estimation, supposition, surmise, theory
[TahlilGaran] English Synonym Dictionary ▲
guess‧work /ˈɡeswɜːk $ -wɜːrk/
noun [uncountable] the method of trying to find the answer to something by guessing:
There’s a lot of guesswork in these calculations. [TahlilGaran] Dictionary of Contemporary English ▲