अधर्मं धर्ममिति या मन्यते तमसाऽऽवृता।सर्वार्थान्विपरीतांश्च बुद्धिः सा पार्थ तामसी
adharmaṁ dharmam iti yā manyate tamasāvṛitā sarvārthān viparītānśh cha buddhiḥ sā pārtha tāmasī
And that which, shrouded in Ignorance, thinks wrong to be right, and sees everything perversely, O Arjuna, that intellect is ruled by Darkness.
Translated by Shri Purohit Swami
That intellect, O Arjuna, which is enveloped in darkness and sees Adharma as Dharma and all things perverted, is Tamasic (dark).
Translated by Swami Sivananda
Word meanings (from the gita/gita dataset)
adharmam—irreligion; dharmam—religion; iti—thus; yā—which; manyate—imagines; tamasa-āvṛitā—shrouded in darkness; sarva-arthān—all things; viparītān—opposite; cha—and; buddhiḥ—intellect; sā—that; pārtha—Arjun, the son of Pritha; tāmasī—of the nature of ignorance