certain; confident in what one knows

definite; not to be doubted

सुनिश्चित

English Usage: Are you sure about the time of the meeting?

Hindi Usage: क्या आप बैठक के समय के बारे में सुनिश्चित हैं?

indeed; certainly

without doubt

बिना संदेह

English Usage: She will sure help you with your homework.

Hindi Usage: वह बिना संदेह आपके होमवर्क में मदद करेगी।

something that is certain

guarantee

गारंटी

English Usage: You need to provide a sure for the investment.

Hindi Usage: आपको निवेश के लिए एक गारंटी प्रदान करनी होगी।