Divergent

4. Roughly almond-shaped mass of grey matter inside each cerebral hemisphere, involved with the experiencing of emotions (noun)
6. Pitifully sad and abandoned or lonely (adjective)
7. Showing fearlessness (adjective)
10. The act of rejecting something (noun)
12. Mutual trust and friendship (noun)
13. Either of two masses of grey matter lying between the cerebral hemispheres relaying sensory information and acting as a center for pain perception (noun)
14. To promote a belief or course of action (verb)
16. Self-assertive in a rude, noisy, or overbearing way (adjective)
18. Quality of being honest (noun)

1. A deep fissure in a surface (noun)
2. Away from the appropriate, planned or expected course (adverb & adjective)
3. Showing great knowledge (adjective)
5. Tending to be different (adjective)
8. Deriving pleasure from inflicting pain (adjective)
9. Too great to be overcome (adjective)
10. A friendly relationship (noun)
11. Relating to deep inward feelings rather than to the intellect (adjective)
13. Sparing in the use of words, abrupt (adjective)
15. State of being homesick (adjective)
17. A mass departure of people (noun)