Cool MateArbitrary vs Random
When to use each in English, with meaning, register, and examples.
Arbitrary
Top 2,000 (common)C1adjective
Random
Top 1,000 (very common)B2adjective
Most common: Random
| Arbitrary | Random | |
|---|---|---|
| Pronunciation | 🇬🇧 /["/ˈɑːbɪtrəri//ˈɑːbɪtri/"]/🇺🇸 /["/ˈɑːrbɪtreri/"]/ | 🇬🇧 /["/ˈrændəm/"]/🇺🇸 /["/ˈrændəm/"]/ |
| Meaning | Chosen randomly or without any reason. | without a definite plan or pattern |
| Example | The choice of players for the team seemed completely arbitrary. | I picked a random number between one and ten. |
| Register | Neutral | Neutral |
| How common | Top 2,000 (common) | Top 1,000 (very common) |
| CEFR level | C1 | B2 |
| Part of speech | adjective | adjective |
| Collocations | be, seem, completely, entirely, purely | be, seem, completely, entirely, purely |
| Antonyms | necessary, justifiable, systematic | structured, planned, ordered |
| Common mistakes | Confused with 'arbitrate', which means to settle a dispute., Using it where 'random' is more appropriate., Mixing up 'arbitrary' with 'arbitrary choice' instead of 'arbitrary decision'. | Confused with 'arbitrary' — 'random' implies no specific order, while 'arbitrary' can imply choice without reason., Using 'randomly' when the context is not spontaneous or by chance., Overusing 'random' in apologetic contexts, like saying 'random stuff' without clarity. |
| Usage notes | Used in academic or technical contexts, it may sound too formal in casual conversation. Avoid using when you mean something more specific, like 'random' or 'unintentional'. | Use 'random' to describe things that happen by chance. It's appropriate in both casual conversations and formal writing, but avoid overusing it to prevent sounding vague. |
Frequently asked questions: Arbitrary vs Random
What's the difference between Arbitrary and Random?
Arbitrary: Chosen randomly or without any reason. Random: without a definite plan or pattern
Which is more common: Arbitrary and Random?
Random is the most common in everyday English.
Which is more advanced: Arbitrary and Random?
Arbitrary is the highest level, at C1, on the CEFR scale.
Are Arbitrary and Random the same CEFR level?
Arbitrary: C1, Random: B2 on the CEFR scale.
What part of speech are Arbitrary and Random?
Arbitrary: adjective, Random: adjective.
Can you show an example of each?
Arbitrary: The choice of players for the team seemed completely arbitrary. Random: I picked a random number between one and ten.
Can I use Arbitrary and Random interchangeably?
Not always. Arbitrary and Random are related and overlap in some contexts, but they differ in register, how common they are, and usage, so swapping one for another can change the meaning or tone. Check the differences above before substituting.