Sentence Completion

Cognizant (adj.) means fully knowledgeable or informed, conscious, aware.

Undulating (adj.) means characterized by a wavelike motion.

Optimistic (adj.) means taking the most hopeful view; feeling that everything in nature is for the best.

Malodorous (adj.) means having a foul-smelling odor.

A realm (n.) is a knowledge domain that you are interested in; a kingdom or domain.

To forfeit (v.) means to be deprived of or lose the right to by the act of a crime, offense, fault, breach, or error.

To negate (v.) means to nullify, invalidate, or deny.

Indigenous (adj.) means originating or being native to a specific region or country; also inherent or natural.

Derogatory (adj.) means tending to lessen in value, to detract or diminish; disparaging, belittling, injurious.