Existing in a state that is not depleted or diminished.

अवशिष्ट

English Usage: The unexhausted resources of the region are a key to its development.

Hindi Usage: क्षेत्र के अवशिष्ट संसाधन उसके विकास की कुंजी हैं।

Not used up; still able to be utilized or drawn upon.

अवर्जित

English Usage: His unexhausted enthusiasm for the project inspired everyone.

Hindi Usage: उसका प्रोजेक्ट के लिए अवर्जित उत्साह सभी को प्रेरित करता है।