A style that is relaxed and informal.

आरामदायक

English Usage: She wore casual clothes to the party.

Hindi Usage: उसने पार्टी में आरामदायक कपड़े पहने।

A physical device used for opening locks.

चाबी

English Usage: I lost the key to my car.

Hindi Usage: मैं अपनी कार की चाबी खो बैठा।

Of crucial importance; essential.

महत्वपूर्ण

English Usage: This information is key to understanding the problem.

Hindi Usage: यह जानकारी समस्या को समझने के लिए महत्वपूर्ण है।