lasting or intended to last indefinitely without change

an organism that lives in or on another organism and benefits at its expense

परजीवी

English Usage: The parasite consumed the nutrients from its host without providing any benefits.

Hindi Usage: परजीवी ने अपने मेज़बान से पोषक तत्वों का सेवन किया बिना कोई लाभ दिए।