A person who makes an estimation or conjecture without sufficient information.

A person who takes a chance or risks uncertainties in making a decision.

जोखिम उठाने वाला व्यक्ति

English Usage: The guesser took a leap of faith in the competition.

Hindi Usage: अनुमान लगाने वाले ने प्रतियोगिता में एक बड़ा जोखिम उठाया।