Adharma is the Sanskrit antonym of Dharma. It means 'that which is not in accord with the Dharma'. Connotations include unnaturalness, wrongness, evil, immorality, wickedness, and vice.
Adharma (Sanskrit: अधर्म) is derived from combining "a" with "dharma", which literally implies "not-dharma". It means immoral, sinful, wrong, wicked, unjust, unbalanced, or unnatural.
Ariel Glucklich translates Adharma as chaos, disorder, non-harmonious and explains it as opposite of Dharma. Glucklich states that adharma isn't the binary opposite of Dharma or absolutely unethical in Indian philosophy. Rather it is a complex functional subjective term just like dharma, with shades of meaning, that depends on circumstances, purpose and context.
The Vishnu Purana recites a Hindu legend that includes Dharma and Adharma as mythical characters, and it is loaded with symbolism about virtues and vices, morality and ethics. The lineage is as follows,
The progeny of Dharma (wise) by the daughters of Daksha were as follows: by Sraddhá (devotion) he had Kama (desire); by Lakshmí (wealth, prosperity), was born Darpa (pride); by Dhriti (courage), the progeny was Niyama (precept); by Tusht́i (inner comfort), Santosha (contentment); by Pusht́i (opulence), the progeny was Lobha (cupidity, greed); by Medhá (wisdom, experience), Sruta (sacred tradition); by Kriyá (hard work, labour), the progeny were Dańd́a, Naya, and Vinaya (justice, politics, and education); by Buddhi (intellect), Bodha (understanding); by Lajjá (shame, humility), Vinaya (good behaviour); by Vapu (body, strength), Vyavasaya (perseverance). Shanti (peace) gave birth to Kshama (forgiveness); Siddhi (excellence) to Sukha (enjoyment); and Kírtti (glorious speech) gave birth to Yasha (reputation). These were the sons of Dharma; one of whom, Kama (love, emotional fulfillment) had baby Hersha (joy) by his wife Nandi (delight).