* सत् (sat): This word means "true" or "real" and is often used to describe something that is genuine and authentic. It can convey the idea of sincerity in the sense of being honest and genuine.
* निष्कपट (niṣkapata): This word means "without deceit" or "without hypocrisy." It emphasizes the absence of hidden motives or intentions and suggests a straightforward, honest approach.
* आत्मिक (ātmika): This word means "pertaining to the soul" or "spiritual." It can imply sincerity in the sense of acting from a place of deep conviction and integrity.
* श्रद्धावान् (śraddhāvān): This word means "having faith" or "believing." It conveys sincerity in the sense of having a genuine belief in something and acting accordingly.
* निरन्तर (nirantara): This word means "continuous" or "persistent." It can be used to describe someone who is sincere in their actions and follows through on their commitments.
Ultimately, the best Sanskrit word for "sincere" depends on the specific context and the nuance you want to emphasize.