OXFORD DICTIONARY
Septic, adj. contaminated with bacteria from a festering wound etc., putrefying.
septic tank a tank in which the organic matter in sewage is disintegrated through bacterial activity.
septically adv. septicity n.
L septicus f. Gk septikos f. sepo make rotten
THESAURUS
Septic
bad, bad for, cankered, contaminated, diseased, foul, gangrened, gangrenous, harmful, infected, injurious, insalubrious, insanitary, morbid, morbific, mortified, noisome, noxious, pathogenic, pathological, peccant, pestiferous, poisoned, polluted, putrefacient, putrefactive, rotting, saprobic, saprogenic, saprogenous, saprophilous, saprophytic, sphacelated, tainted, ulcerated, ulcerous, unhealthful, unhealthy, unhygienic, unsanitary, unwholesome
ROGET THESAURUS
Septic
Insalubrity
N
insalubrity, unhealthiness, nonnaturals, plague spot, malaria, death in the pot, contagion, toxicity, insalubrious, unhealthy, unwholesome, noxious, noisome, morbific, morbiferous, mephitic, septic, azotic, deleterious, pestilent, pestiferous, pestilential, virulent, venomous, envenomed, poisonous, toxic, toxiferous, teratogenic, narcotic, contagious, infectious, catching, taking, epidemic, zymotic, epizootic, innutritious, indigestible, ungenial, uncongenial, deadly.