To suppose that something is true without having evidence to confirm it

अनुमान करना

English Usage: He surmised that she was upset based on her silence.

Hindi Usage: उसने उसकी चुप्पी के आधार पर यह अनुमान लगाया कि वह परेशान थी।

An idea or opinion based on incomplete evidence

अनुमान

English Usage: Her surmise about the project's failure turned out to be correct.

Hindi Usage: उसका परियोजना की विफलता के बारे में अनुमान सही निकला।