Synonyms:

aprakasah–darkness; apravrttih–inactivity; ca–and; pramadah–madness; mohah–illusion; eva–certainly; ca–also; tamasi–of the mode of ignorance; etani–these; jayante–are manifested; vivrddhe–is developed; kuru-nandana–O son of Kuru.

Translation:

O son of Kuru, when there is an increase in the mode of ignorance; madness, illusion, inertia and darkness are manifested.