- Adulterate: (v) To make impure
- Bane: (n) Cause of harm or annoyance
- Boon: (n) A benefit
- Inimical: (adj) Unfriendly; hostile
- Malevolent: (adj) Showing ill will
- Panacea: (n) A cure-all
- Pernicious: (adj) Very harmful
- Salutary: (adj) Helpful or healthful
- Toxic: (adj) Poisonous
- Vitiate: (adj) Showing ill will