English Thesaurus

Synonyms of 'poisonous'

(adjective) 
Definition
of or like a poison
All parts of the yew tree are poisonous.
Synonyms
toxic
the cost of cleaning up toxic waste
,
fatal
She had suffered a fatal heart attack.
,
deadly
a deadly disease currently affecting dolphins
,
lethal
a lethal dose of sleeping pills
,
mortal
a mortal blow
,
virulent
A virulent form of the disease has appeared in Belgium.
,
noxious
carbon monoxide and other noxious gases
,
venomous
The adder is Britain's only venomous snake.
,
baneful (archaic)
,
mephitic
a mephitic stench
(adjective) 
Definition
malicious
poisonous attacks on the Church
Synonyms
evil
Few people would not condemn slavery as evil.
,
vicious
a vicious attack on a woman's character
,
malicious
She described the charges as malicious.
,
corrupting
,
pernicious (formal)
the pernicious effects of alcoholism
,
baleful
He had a baleful look.
,
baneful (archaic)
,
pestiferous

Additional synonyms

in the sense of baleful
Definition
harmful, menacing, or vindictive
He had a baleful look.
Synonyms
pernicious (formal),
intimidatory,
maleficent,
bodeful,
louring or lowering,
minacious
in the sense of baneful
in the sense of deadly
Definition
likely to cause death
a deadly disease currently affecting dolphins

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Video: pronunciation of 'poisonous'

Source

Thesaurus for poisonous from the Collins English Thesaurus
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