A process or outcome lacking a definite pattern, purpose, or set of rules; arbitrary.

अनियमित

English Usage: The selection of the winners was completely random.

Hindi Usage: विजेताओं का चयन पूरी तरह से अनियमित था।

Made, done, happening, or chosen without method or conscious decision; lacking aim.

प्रायोगिक

English Usage: She made a random choice from the menu.

Hindi Usage: उसने मेन्यू से एक प्रायोगिक चयन किया।