sur·mise 
/sɚˈmaɪz/ verb
sur·mis·es; sur·mised; sur·mis·ing /sɚˈmaɪz/ verb [+ obj] formal : to form an opinion about something without definitely knowing the truth : guess
▪ We can only surmise what happened. ▪ He must have surmised that I was not interested.
▪ We can only surmise what happened. ▪ He must have surmised that I was not interested.
— surmise noun, plural surmises [count, noncount]
▪ This is no more than a surmise. [=guess]
▪ This is no more than a surmise. [=guess]
