poison/poisonous
ADJECTIVE
harmful
Synonyms
WEAK
bad
baleful
baneful
corrupt
corruptive
dangerous
deadly
deleterious
destructive
detrimental
evil
fatal
hurtful
infective
lethal
malicious
malignant
mephitic
miasmatic
morbid
mortal
nocuous
noisome
noxious
peccant
pernicious
pestiferous
pestilential
septic
toxic
toxicant
toxiferous
venomous
vicious
viperous
virulent
Antonyms
From Roget's 21st Century Thesaurus, Third Edition Copyright © 2013 by the Philip Lief Group.