More than any other Mahābhārata character, Karṇa brings out the ambiguities of dharma pivotal to the epic. On the one hand, a mean and dreadful enemy, who must be defeated by the righteous Pāṇḍavas, Karṇa is, on the other hand, outstandingly loyal in his commitment to Duryodhana. Again and again, throughout the Mahābhārata, Karṇa is shown to be caught up in a web of curses, oaths, and promises, which, in fact, make his cause hopeless.
"Karṇa." The Concise Oxford Dictionary of World Religions. . Encyclopedia.com. (August 15, 2018). http://www.encyclopedia.com/religion/dictionaries-thesauruses-pictures-and-press-releases/karna
"Karṇa." The Concise Oxford Dictionary of World Religions. . Retrieved August 15, 2018 from Encyclopedia.com: http://www.encyclopedia.com/religion/dictionaries-thesauruses-pictures-and-press-releases/karna