What’s the Plural of Thief: Understanding Singular and Plural Nouns

  • The plural of “thief” is “thieves,” which follows a common English pluralization rule.
  • The definition of “thief” and “thieves” pertains to an individual who commits theft, irrespective of number.
  • Knowledge of plural forms, such as “thieves,” is essential for proper English communication and grammar.

The English language is full of curiosities, particularly when it comes to forming plurals. One such curiosity involves the pluralization of the word “thief.” While the singular form is straightforward, the transformation of this noun into its plural form may pose a challenge for learners. The word “thief” belongs to a category of English nouns that follow a specific rule for pluralization.

Is Thief Singular or Plural?

Thief is the singular form and refers to one individual who steals. In constructing the plural form of thief, English takes a turn from its more straightforward patterns, such as simply adding an “s” or “es” to a noun.

Tables Showing the Transformation from Singular to Plural:


The table illustrates a common irregular plural formation in English:

Replace “f” with “ves”leaf → leaves

Most nouns ending in -f or -fe undergo a spelling change to form the plural by replacing the -f or -fe with -ves. Here are some key points to note:

  • Singular: Thief is used when talking about one individual who commits theft.
  • Plural: Thieves is the correct term when referring to two or more individuals partaking in the act of stealing.

In sentences, proper usage would be as follows:

  • The sole thief was apprehended by police.
  • The security system was updated to deter potential thieves.

Definition of a Thief

The term thief refers to an individual involved in the act of theft, which is the unlawful taking of someone else’s property without their consent. It implies a covert method of operation, where the intent is to take without being detected. The concept of a thief has been codified in legal systems around the world as a violation of personal or corporate property rights.

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Thieves operate in various contexts, sometimes individually or as part of larger groups. Their activities can range from petty theft to grand larceny, depending on the value of the property stolen.

  • Classification of Theft:
    • Petty Theft: Involving items of lesser value
    • Grand Larceny: Involving items of substantial value

The motivations behind theft can be as varied as the individuals who commit the act, from necessity to compulsion, or opportunism.

  • Common Attributes of Thieves:
    • Stealth
    • Speed
    • Cunning
    • Secrecy

What’s the Plural of Thieves

Regular and Irregular Plurals
Generally, to form a plural, we add an “s” or “es” at the end of a word. However, some nouns undergo more complex changes. These are known as irregular plurals. Words like “thief” fall into this category. The correct plural form of thief is thieves. This transformation happens because of a spelling rule for nouns ending in “f” or “fe”.


Spelling Transformation Rules

  • Rule: For many nouns ending in “f” or “fe”, replace with “ves”.
  • Exceptions: Some nouns simply take an “s”.

Examples of usage in sentences:

  • The museum was on high alert after they caught wind of thieves planning a heist.
  • The lone thief was apprehended by the authorities.

Irregular Plurals List

Here are some other examples of irregular plurals following a similar pattern to thief:

  • Half becomes halves
  • Life becomes lives
  • Wife becomes wives

Nouns Ending in -f/-fe and –ves

Regular Patterns:
For many nouns ending in -f or -fe, the plural form requires substituting these endings with -ves.

For example:

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Some nouns ending with -f maintain the f and simply add an es or s to form the plural.

Here are a few examples:


Irregular Plurals:
The English language includes various irregular plural forms that don’t adhere to straightforward rules. Understanding these unique forms usually requires memorization.

  • Dwarf: Has two accepted plural forms, dwarfs and dwarves, the latter of which popularized by J.R.R. Tolkien.
  • Hoof: Can be hoofs in the context of animal anatomy and hooves when referred to in the abstract sense.

Origin of the Word Thief/Thieves

In English, the term “thief” traces its etymology to the Old English “þēof”, which has Germanic origins. It’s interesting to see how the word has retained much of its pronunciation and meaning through centuries, signifying a person who steals.

Old EnglishProto-GermanicMeaning
þēof*þeubazThief, robber

Derived from the Germanic root, the word evolved in Middle English to its current form, “thief.” The transition to what we now consider modern English didn’t significantly alter the term’s appearance or its connotation.

Regarding the plural form, “thieves” adheres to the standard rule of changing the ‘f’ to ‘ves’ for nouns ending with a ‘f’ or ‘fe.’ This is a common pattern seen in English plurals, such as:

  • Half becomes halves.
  • Life becomes lives.

Examples of Thief Used in Context

When describing a single individual who steals, “thief” is the appropriate term. For instance:

  • The museum security caught a thief trying to take a valuable painting.
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Conversely, when referring to multiple individuals, the term “thieves” is used. For example:

The thief was apprehended.The thieves were arrested.
A skilled thief can be quite elusive.A band of thieves can be a significant problem for law enforcement.

Further examples of “thieves” in sentences help illustrate its use:

  • Italicized for emphasis: The thieves quietly entered the building.
  • In a list:
    • The homeowners reported encountering thieves in the area.
    • Police have launched a campaign to deter car thieves.
    • Art thieves often target museums for their high-value items.

Examples of the Word Thieves in Sentences

Common Usage:

  • The security footage clearly showed the thieves leaving the scene with the stolen goods.
  • Local businesses have increased security measures due to a rise in the number of thieves in the area.

Proper Nouns:

Singular Proper NounSentence with Plural “Thieves”
The Thief of BaghdadThe movie “The Thieves of Baghdad” was a gripping tale of adventure and cunning.
Carmen SandiegoIn the game, players track Carmen Sandiego and her thieves around the globe.

Idiomatic Expressions:

  • Thieves in law is a term originating from Russia that refers to a professional code among high-profile criminals.
  • The phrase “honor among thieves” suggests that even criminals follow a certain code of conduct within their group.

Synonyms for the Word Thief/Thieves

Singular Synonyms for “Thief”

Formal TermsSlang Terms
BurglarSneak thief

Plural Synonyms for “Thieves”

Group Oriented TermsIndividualistic Terms
  • A thief operating on a ship or coast could be called a pirate or a footpad when traveling on foot.
  • One who steals cars might be referred to as a carjacker, while a thief specializing in breaking into safes could be termed a safecracker.
  • In a more digital context, a thief involved in stealing information electronically can be labeled a hacker.

Phrases Including the Word Thief/Thieves

The first table outlines common phrases using the singular form “thief”:

Phrase with “Thief”Usage in a Sentence
A thief in the night“He moved like a thief in the night, silently and swiftly.”
Caught red-handed“The jewelry thief was caught red-handed by the police.”
Light-fingered“The light-fingered thief had stolen wallets from the crowd.”

The following table provides examples with the plural “thieves”:

Phrases with “Thieves”Usage in a Sentence
Honor among thieves“They say there is honor among thieves, but trust is still scarce.”
Thieves’ den“The police raided the thieves’ den and arrested several suspects.”
As thick as thieves“They were as thick as thieves, always seen together plotting.”

In everyday language, these phrases can be used:

  • The museum installed high-security systems to deter any would-be thieves.
  • She referred to the mischievous children as little thieves after they snuck some cookies from the jar.


  1. Definition of thief.
  2. Synonyms of thief.
  3. Example sentences for thief.
  4. Origin of the word thief.

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