Not capable of being converted or changed into a different state.

परिवर्तनीय नहीं

English Usage: The old format of the document was unconvertible to the new software.

Hindi Usage: दस्तावेज़ का पुराना प्रारूप नए सॉफ़्टवेयर में परिवर्तनीय नहीं था।