septic
Pronunciation: /ˈsɛptɪk/
adjective

Origin:
early 17th century: via Latin from Greek sēptikos, from sēpein 'make rotten'

Do not confuse septic with sceptic. Septic means 'infected with bacteria' ( septic wounds), whereas sceptic means 'a person who questions accepted beliefs or statements' ( numerous sceptics poured scorn on his claim).