Across
- 2. make (something) look more attractive
- 6. treat with a vaccine to produce immunity against a disease
- 8. move continuously through a closed system
- 9. make (something) more difficult
Down
- 1. create or prepare methodically
- 3. be grateful for something
- 4. create or initiate (something)
- 5. form a theory about a subject without evidence
- 7. make (something) worse or more serious