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

See also: epidemic, noxious, pestilence

• tank iron
• tank locomotive
• tank shell
• tank ship
• tank suit
• tank top
• tank town
• tanka
• tankage
• tankard
• tanked up
• tanker
• tanker plane
• tankful
• tannate
• tanned
• Tannenberg
• tanner
• tanner's cassia
• tannery
• tannia
• tannic
• tannic acid
• tannin
• tanning