Used when there is uncertainty and not enough facts to predict with confidence. I didn't see who took it, so naming a suspect would be guesswork.
Pro Tip 2/3
Informed Versus Pure
Distinguish between 'educated guesswork', based on some knowledge, and 'pure guesswork', based on none. Choosing the answer was educated guesswork, as I recalled some of the lesson.
Pro Tip 3/3
Negative Connotation
'Guesswork' often implies a lack of professionalism or thoroughness in the task. They frowned upon the guesswork in the report, preferring clear evidence.