1. Exceedingly harmful
   - baneful, deadly, pernicious 
2. Likely to spread and cause an epidemic disease
   - pestilential, pestiferous, plaguey

See also: epidemic, noxious, pestilence

• sixsome
• norfolk island pine
• Norfolk jacket
• Norfolk terrier
• Norfolk wherry
• Norge
• norgestrel
• nori
• noria
• Norinyl
• nork
• Norlestrin
• Norlutin
• norm
• Norma
• Norma Jean Baker
• normal
• normal curve
• normal distribution
• normal dwarf
• normal fault
• normal school
• normal tension glaucoma
• normalcy
• normalisation