Fool vs Idiot vs Moron vs Told you he was an asshole

When to use each in English, with meaning, register, and examples.

Fool

Top 2,000 (common)B2noun

Idiot

VulgarTop 2,000 (common)C1noun

Moron

InformalTop 5,000 (fairly common)

Told you he was an asshole

InformalBeyond 10,000 (less common)
Most formal: Fool
 FoolIdiotMoronTold you he was an asshole
Pronunciation🇬🇧 /["/fuːl/"]/🇺🇸 /["/fuːl/"]/🇬🇧 /["/ˈɪdiət/"]/🇺🇸 /["/ˈɪdiət/"]/🇬🇧 //ˈmɔːrɒn//🇺🇸 //ˈmɔrɑn//🇬🇧 //təʊld juː hi wəz ən ˈæs.həʊl//🇺🇸 //toʊld ju hi wəz ən ˈæs.hoʊl//
Meaninga person who makes mistakes or is easily trickedA very silly or stupid person.A person who is very silly or stupid.Said you that he was a bad person.
ExampleHe felt like a fool after forgetting his best friend's birthday.When I lost my passport, I felt such an idiot.I can't believe he forgot his own birthday; what a moron!I told you he was an asshole when he made that comment.
RegisterNeutralVulgarInformalInformal
How commonTop 2,000 (common)Top 2,000 (common)Top 5,000 (fairly common)Beyond 10,000 (less common)
CEFR levelB2C1--
Part of speechnounnoun
Collocationsbig, great, silly, feel, feel like, look, like a fool, fool of a something, act the fool, play the fool, be no foolbabbling, big, blithering, be, feel, feel like, make an idiot of yourself, babbling, big, blithering, be, feel, feel like, make an idiot of yourselftotal moron, complete moron, such a moronnotorious asshole, selfish asshole, call someone an asshole
Antonymsgenius, sensible, wisegenius, smart, intellectgenius, intellect, smart person-
Common mistakesUsing 'fool' as a verb without an object, e.g., 'I fool.', Confusing 'fool' with 'fools' as plural without context., Overusing in formal conversations where 'deceived' may be more appropriate.Used in formal writing or speeches., Overused, making it sound less impactful., Confused with 'moron' or 'fool' in severity.Used in formal writing contexts., Confused with 'idiot' or 'fool', though they're similar., Used to describe someone in a non-derogatory context.Confusing 'asshole' with less offensive terms., Using this phrase in a formal context., Not understanding the strong negative connotation of 'asshole'.
Usage notesUsed when someone is deceived or makes a silly decision. Avoid in serious contexts to not offend someone.Considered an insult, this word is usually used in informal situations. It's not appropriate in formal contexts or polite conversations. Use caution around friends and family.Use this word informally to describe someone acting foolishly. It's often considered derogatory and shouldn't be used in formal contexts.This phrase is very informal and can be considered vulgar. It's typically used among friends but can offend others. Use caution in formal settings.

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Fool
Idiot
Moron
Told you he was an asshole

Frequently asked questions: Fool vs Idiot vs Moron vs Told you he was an asshole

What's the difference between Fool, Idiot, Moron, and Told you he was an asshole?

Fool: a person who makes mistakes or is easily tricked Idiot: A very silly or stupid person. Moron: A person who is very silly or stupid. Told you he was an asshole: Said you that he was a bad person.

Which is more formal: Fool, Idiot, Moron, and Told you he was an asshole?

Fool is the most formal of these.

Which is more advanced: Fool, Idiot, Moron, and Told you he was an asshole?

Idiot is the highest level, at C1, on the CEFR scale.

Can you show an example of each?

Fool: He felt like a fool after forgetting his best friend's birthday. Idiot: When I lost my passport, I felt such an idiot. Moron: I can't believe he forgot his own birthday; what a moron! Told you he was an asshole: I told you he was an asshole when he made that comment.

Can I use Fool, Idiot, Moron, and Told you he was an asshole interchangeably?

Not always. Fool, Idiot, Moron, and Told you he was an asshole 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.