What is sanskrit word for reliable?

There isn't a single perfect Sanskrit word for "reliable" in the way we use it in English. However, depending on the context, you could use:

* विश्वसनीय (Vishvasaniya): This is the closest translation, meaning "trustworthy" or "credible."

* निरपेक्ष (Nirapeksha): This means "absolute" or "unbiased," which can imply reliability.

* सत्यापन (Satyapan): This means "verification" or "confirmation," which suggests something is reliable.

* विश्वास (Vishvas): This means "faith" or "trust," which can also imply reliability.

The best choice would depend on the specific nuance you want to convey. For example, "Vishvasaniya" would be best for someone who is consistently dependable, while "Satyapan" would be better for something that has been checked and proven to be accurate.