'Guesswork' definitions:

Definition of 'guesswork'

From: WordNet
noun
An estimate based on little or no information [syn: guess, guesswork, guessing, shot, dead reckoning]

Definition of 'Guesswork'

From: GCIDE
  • Guesswork \Guess"work`\, n. Work performed, or results obtained, by guess; conjecture. [1913 Webster]