Something that is kept hidden from others.

रहस्य

English Usage: The most secret of the government's operations were revealed.

Hindi Usage: सरकार के सबसे गुप्त ऑपरेशनों का खुलासा किया गया।

To the greatest degree; superlative of many or much.

अधिकतम

English Usage: She kept the most secret information to herself.

Hindi Usage: उसने सबसे गुप्त जानकारी अपने पास रखी।

In the highest degree; more than others.

सबसे अधिक

English Usage: He was most secretive about his plans.

Hindi Usage: वह अपनी योजनाओं के बारे में सबसे अधिक गुप्त रहा।