fallacious

C2+ Topic:Religion & Belief

US /fəˈleɪʃəs/ UK /fəˈleɪʃəs/ See IPA manual

adj

Meanings

1

adj
based on a mistaken belief or unsound reasoning

His argument rests on a fallacious comparison.

Thesaurus

Synonyms

1 adj · based on a mistaken belief... erroneous misleading spurious unsound deceptive specious false illogical

Opposites

valid sound correct true logical

Word family

Forms fallaciouslyfallaciousness

Derived forms fallaciouslyfallaciousness

Related forms fallacy fail fallible

Etymology

From Latin 'fallāx' (stem 'fallāci-', 'deceptive'), from 'fallere' ('to deceive, disappoint'), via the English suffix '-ous'.

fallāx Latin fallere Latin

View etymology graph ->

Topics

Religion & Belief Word Formation & Derivatives

# fallacious

**Type:** Word
**Level:** C2+
**Part of speech:** adj
**IPA (US):** fəˈleɪʃəs
**IPA (UK):** fəˈleɪʃəs

## Meanings
1. based on a mistaken belief or unsound reasoning

## Examples
- His argument rests on a fallacious comparison.

## Synonyms
- erroneous
- misleading
- spurious
- unsound
- deceptive
- specious
- false
- illogical

## Antonyms
- valid
- sound
- correct
- true
- logical

## Derived Forms
- fallaciously
- fallaciousness

## Related Forms
- fallacy
- fail
- fallible

## Roots and Affixes
- Root: fallāx
- Root: fallere

## Etymology
From Latin 'fallāx' (stem 'fallāci-', 'deceptive'), from 'fallere' ('to deceive, disappoint'), via the English suffix '-ous'.

## AI Etymology
Fallacious is from Latin 'fallāx' (stem 'fallāci-', 'deceptive'), from 'fallere' ('to deceive, disappoint'), via the English suffix '-ous'. Important recorded forms include fallāx (Latin) and fallere (Latin). Morphologically, the word is a built form whose named elements carry part of the historical sense. The current sense covers based on a mistaken belief or unsound reasoning. The wider family includes derived forms such as fallaciously and fallaciousness and related words such as fallacy, fail, and fallible.

## Topics
- Religion & Belief
- Word Formation & Derivatives

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fallacious

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