Surmise (verb)

1. To infer or arrive at a conclusion based on incomplete or uncertain evidence.
2. To form an opinion or make a guess about something without having enough information.

Origin:

From the old french word "surmettre" meaning to suppose or to believe.

Examples:

1. He surmised that the cause of the problem was a lack of funding.
2. I surmise that she is unhappy with her job.
3. It is difficult to surmise the outcome of the election.
4. He surmised that the company was going to go bankrupt.
5. We can only surmise the reason for her sudden resignation.