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Amphiboly

Also Known As: Syntactic Ambiguity Grammatical Ambiguity
Informal Fallacy ID: amphiboly

Definition

Amphiboly is a fallacy arising from ambiguous grammatical structure rather than ambiguous individual words. The sentence can be parsed in multiple ways due to poor syntax, dangling modifiers, or unclear pronoun references, leading to different interpretations. Unlike equivocation (which exploits word-level ambiguity), amphiboly exploits sentence-level structural ambiguity.

Examples

"The professor said on Monday he would give an exam." (Did the professor make this statement on Monday, or is the exam scheduled for Monday? The grammatical structure allows both readings.)

The headline reads: 'Police help dog bite victim.' It is unclear whether the police assisted someone who was bitten by a dog, or whether the police helped a dog bite a victim — both readings are grammatically valid from the sentence structure.

A recipe instruction says: 'Serve the dessert to the guests in small bowls.' Does this mean the dessert should be placed into small bowls before serving, or that the guests who are in small bowls should be served the dessert? The ambiguous grammar creates two absurdly different readings.

Verification Steps
Verification Steps
Binary yes/no questions that an AI must answer to detect a reasoning pattern in a text.
Each of the 452 aspects has verification steps — simple yes/no questions designed to systematically detect whether a pattern appears in a text. For ad hominem: "Does the argument attack a person rather than their claim?" For false dichotomy: "Are only two options presented when more exist?" This ensures consistent, reproducible analysis.
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Binary (yes/no) questions an LLM must answer to identify this aspect:

  1. 1

    Is the ambiguity in the argument due to sentence structure rather than individual word meaning?

    Type: binary
  2. 2

    Does the grammatical construction allow for multiple interpretations?

    Type: binary
  3. 3

    Is the argument exploiting the ambiguous structure to draw a conclusion?

    Type: binary
Deep Dive
The expandable detail section on each aspect page with examples, psychology, and counter-strategies.
The Deep Dive section provides in-depth information about each aspect: a real-world example showing the pattern in action, an explanation of why it works psychologically, practical advice on how to counter it, alternative names, and links to related aspects.
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Related Aspects

← related to
Syntactic Ambiguity

Syntactic ambiguity occurs when the grammatical structure of a sentence — rather than the meaning of individual words — allows for multiple interpretations, and this structural ambiguity is exploited in argumentation. Unlike equivocation (which involves ambiguous words), syntactic ambiguity arises from how words are grouped, how modifiers attach, or how clauses relate. The arguer benefits from one reading while retreating to another if challenged.

Hierarchical Context

→ is a Informal Fallacies

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