Crazy or silly

crazy (adjective)

informal not at all sensible or practical

silly (adjective)

used for saying you think something or someone is not sensible or does not deserve any respect

ridiculous (adjective)

silly or unreasonable and deserving to be laughed at

mad (adjective)

very silly or stupid

insane (adjective)

informal very stupid or crazy, especially in a way that is likely to cause serious problems, harm, or injury

ludicrous (adjective)

extremely silly

childish (adjective)

behaving in a silly and annoying way, like a small child

laughable (adjective)

very silly, or unreasonable

not in your right mind/not right in the head ()

crazy

over-the-top (adjective)

informal someone or something that is over-the-top is so extreme that they seem unreasonable or silly. You can also say that they are OTT

adolescent (adjective)

silly, and considered typical of a young person

(as) mad as a hatter/March hare ()

extremely silly or strange, sometimes because of mental illness

bananas (adjective)

informal silly or crazy

barking mad (adjective)

Britishinformal completely crazy

barmy (adjective)

Britishinformal crazy or silly

batty (adjective)

informal slightly crazy

bonkers (adjective)

informal crazy

certifiable (adjective)

humorous behaving in a crazy unreasonable way

cheesy (adjective)

informal lacking style or good quality and slightly silly

cockamamie (adjective)

Americaninformal silly or impossible to understand

cock-eyed (adjective)

informal silly and not practical

crackbrained (adjective)

informal strange and not sensible

crackers (adjective)

Britishinformal crazy

crackpot (adjective)

informal slightly crazy

crazed (adjective)

completely crazy and uncontrolled

-crazed (suffix)

used with some nouns for saying what makes someone behave in a crazy and uncontrolled way

daft (adjective)

informal silly and not sensible or reasonable

daft (adjective)

informal crazy

demented (adjective)

informal behaving in a strange, stupid, or crazy way

dippy (adjective)

informal silly, especially in a pleasant or funny way

ditsy ()

another spelling of ditzy

ditzy (adjective)

informal silly and not reliable

dizzy (adjective)

informal silly, careless, and not interested in serious things

doolally (adjective)

Britishinformal crazy

dotty (adjective)

informal old-fashioned slightly crazy

eccentric (adjective)

someone who is eccentric often behaves in slightly strange or unusual ways

far gone (adjective)

informal extremely drunk, ill, or crazy

feather-brained (adjective)

informal very silly

flaky (adjective)

informal crazy

fool (adjective)

Americaninformal stupid or silly

fool enough to do something ()

so stupid that you do something that is not sensible

frivolous (adjective)

behaving in a silly way in situations where you should be behaving in a serious or sensible way

full of shit ()

always saying things that are stupid or not true

gonzo (adjective)

mainly Americaninformal strange, unusual, or crazy

goofy (adjective)

informalmainly American silly, especially in a funny or pleasant way

immature (adjective)

an immature person behaves in a silly way, as though they are much younger than they really are

juvenile (adjective)

silly and not suitable for an adult

kitsch (adjective)

done in a way that some people find attractive or funny, but that you think is silly

kooky (adjective)

informal silly, or strange

loco (adjective)

mainly Americaninformal crazy

loony (adjective)

informal crazy, or strange

loopy (adjective)

informal crazy, or silly

mad (adjective)

informal tending to behave in a strange way that other people sometimes consider funny

madcap (adjective)

very silly

maniacal (adjective)

crazy and often frightening

mental (adjective)

offensive crazy or stupid

moonstruck (adjective)

informal behaving in a silly or slightly crazy way, especially when you are in love

naff (adjective)

Britishinformal silly, or lacking taste (=good judgment about style, fashion, or what is suitable in a particular situation)

nuts (adjective)

informal crazy

nutty (adjective)

informal crazy, or very strange

off kilter ()

slightly strange or crazy, or not right in some way

OTT (adjective)

mainly spoken over-the-top: extreme or unreasonable

out of your tree ()

not thinking in a clear or sensible way

out to lunch ()

behaving or thinking in a strange or crazy way

potty (adjective)

Britishinformal crazy

preposterous (adjective)

formal extremely unreasonable or silly

puerile (adjective)

formal like a silly young person, or like something they would say or do

raving (adjective)

informal behaving or talking in a stupid or crazy way

ridiculously (adverb)

in a way that seems silly or unreasonable

risible (adjective)

formal silly or bad enough to make you laugh

round the twist ()

crazy

silly (adjective)

in a state when you are not able to do anything sensible

someone is (living) in cloud-cuckoo-land ()

used for saying that someone is silly if they believe that there are no problems in a situation

sophomoric (adjective)

mainly American silly in a way that is typical of a child

stark raving/staring mad ()

completely crazy

tomfool (adjective)

informal old-fashioned not sensible

touched (adjective)

informal old-fashioned slightly crazy, in a harmless way

wacko (adjective)

informal crazy, or very strange

warped (adjective)

informal someone who is warped has thoughts or ideas that most people think are very strange and frightening

whacko ()

another spelling of wacko

Synonyms and antonyms of Crazy or silly in British Thesaurus