causing, likely to cause, death

causing end of life

causing destruction; fond of, in the habit of, destroying

injurious, devastating

very wicked, bad; likely to cause trouble

sinful, immoral

causing, ending in, death

deadly, lethal

not favourable or promising; unlucky

ominous, unpromising

causing, likely to cause, injury

hurtful

harmful

deadly, injurious

threatening

menacing, foreboding

having poison; causing death or injury

harmful

causing ruin

disastrous, devastating

causing, caused by infection (with disease germs)

harmful

suggesting evil or the likelihood of bad luck

nasty, menacing

menacing, ominous

menacing, ominous

poisonous (the usual word)

poisonous

deadly; spiteful

poisonous; hateful

(of a person) strong; (of ill-feeling, hatred) very strong; (of words etc) full hatred; (of a disease etc) very dangerous

poisonous, lethal