arbitrary
C1Formal, Academic, Legal, Technical
Definition
Meaning
Based on random choice or personal whim, rather than any reason or system; unrestrained in the exercise of power or authority.
Describing decisions, rules, or actions that are made or applied without objective criteria, fairness, or consistency, often appearing unfair or unpredictable.
Linguistics
Semantic Notes
The term carries a strongly negative connotation of unfairness, capriciousness, or the misuse of power. It often implies a lack of justification, reason, or principle behind a decision.
Dialectal Variation
British vs American Usage
Differences
No significant difference in meaning or usage. Spelling and pronunciation are the only variants.
Connotations
Identical negative connotation of unreasoned, unfair, or autocratic decision-making in both dialects.
Frequency
Slightly more frequent in American legal and administrative contexts, but common in both.
Vocabulary
Collocations
Grammar
Valency Patterns
It is arbitrary to + INFan arbitrary + NOUNbe/become/seem/appear arbitraryVocabulary
Synonyms
Strong
Neutral
Weak
Vocabulary
Antonyms
Phrases
Idioms & Phrases
- “[No common idioms; the word itself is used descriptively]”
Usage
Context Usage
Business
Critiquing management decisions perceived as unfair or without clear justification.
Academic
Describing research methodologies, sampling, or classifications that lack a systematic basis.
Everyday
Complaining about rules or decisions that seem random or unfair.
Technical
In mathematics/CS: an arbitrary constant/value; in law: arbitrary detention or punishment.
Examples
By Part of Speech
verb
British English
- [No verb form for 'arbitrary'; the related verb is 'arbitrate'.]
American English
- [No verb form for 'arbitrary'; the related verb is 'arbitrate'.]
adverb
British English
- [The adverb is 'arbitrarily'.] The rules were applied arbitrarily, depending on who you were.
American English
- [The adverb is 'arbitrarily'.] The prices were set arbitrarily, with no relation to cost.
adjective
British English
- The manager's arbitrary dismissal of staff caused widespread discontent.
- The selection criteria seemed completely arbitrary to the applicants.
American English
- The court ruled the law was too arbitrary to be constitutional.
- He picked an arbitrary number between one and ten.
Examples
By CEFR Level
- The teacher's rule seemed arbitrary to the students.
- It felt unfair when the referee made an arbitrary decision.
- The government was accused of using arbitrary arrests to silence its critics.
- The study's sample was criticised for being arbitrary and lacking methodological rigour.
Learning
Memory Aids
Mnemonic
Imagine a judge (ARBIter) throwing a dart at a board to decide your sentence—that's an ARBITRARY ruling.
Conceptual Metaphor
ARBITRARY IS RANDOM / ARBITRARY IS TYRANNICAL
Watch out
Common Pitfalls
Translation Traps (for Russian speakers)
- Avoid confusing with 'арбитражный' (related to arbitration). The correct conceptual match is 'произвольный' (based on whim) or 'необоснованный' (unjustified).
Common Mistakes
- Using 'arbitrary' to mean 'optional' (e.g., 'This field is arbitrary') instead of 'unreasoned'. Confusing spelling with 'arbitrator'.
Practice
Quiz
In which context is the word 'arbitrary' used correctly?
FAQ
Frequently Asked Questions
Not always, but it strongly implies a lack of fair or rational basis, which usually leads to perceptions of unfairness. In technical contexts (e.g., math), it can be neutral, meaning 'any' or 'not fixed'.
'Random' strictly implies a lack of pattern or predictability. 'Arbitrary' emphasizes a decision made by personal whim or without objective justification; it can be deliberate but unreasoned.
Extremely rarely. Its core meaning is negative, suggesting caprice or autocracy. In design or art, it might be used neutrally to describe a non-representational choice.
It is used to criticise actions by authorities that lack a basis in law or due process, e.g., 'arbitrary detention', 'arbitrary exercise of power'.
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