English Thesaurus

Synonyms of 'fallacious'

(adjective) 
Their argument is fallacious.
Synonyms
incorrect
He denied that his evidence was incorrect.
,
wrong
That was the wrong answer – try again.
,
mistaken
She obviously had a mistaken view.
,
false
This resulted in false information being entered.
,
misleading
The article contains several misleading statements.
,
untrue
The allegations were completely untrue.
,
deceptive
Appearances can be deceptive.
, ,
fictitious
a source of fictitious rumours
,
illogical
his completely illogical arguments
,
erroneous
The conclusions they have come to are completely erroneous.
,
illusory
the illusory nature of nationhood
,
delusive
delusive emblems of liberty
, ,
sophistic
,
sophistical

quotation

The conclusion of your syllogism, I said lightly, is fallacious, being based upon licensed premises [Flann O'BrienAt Swim-Two-Birds]

Additional synonyms

in the sense of deceptive
Definition
likely or designed to deceive
Appearances can be deceptive.
in the sense of delusive
delusive emblems of liberty
in the sense of delusory

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Source

Thesaurus for fallacious from the Collins English Thesaurus
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