Synonyms and antonyms of Not sensible or reasonable in British Thesaurus

unreasonable (adjective)

not sensible

wrong (adjective)

not sensible

extreme (adjective)

considered unreasonable by most people

absurd (adjective)

completely stupid, unreasonable, or impossible to believe

childish (adjective)

used about behaviour that is not reasonable or sensible

irrational (adjective)

done or happening without clear or sensible reasons

irresponsible (adjective)

not sensible or able to be trusted to behave in a reasonable way

perverse (adjective)

determined to behave in an unreasonable way, especially by doing the opposite of what is expected or wanted

hysterical (adjective)

reacting to something in an unreasonable way

ridiculous (adjective)

silly or unreasonable and deserving to be laughed at

absurd (adjective)

talking or behaving in a silly or extreme way

absurd (adjective)

deliberately emphasizing what is silly or stupid about people and society

absurdly (adverb)

in a way that seems stupid, unreasonable, or impossible to believe

against someone’s better judgment ()

if someone does something against their better judgment, they do it even though they are not sure that it is a good idea

airy-fairy (adjective)

Britishinformal not practical or sensible

cannot/can’t very well ()

used for saying that it would not be wise or sensible to do something

counterintuitive (adjective)

opposite to what seems obvious or natural

disorganized (adjective)

someone who is disorganized does not deal with things in a clear or sensible way

dreamy (adjective)

someone who is dreamy has a lot of ideas but is not very sensible

empty-headed (adjective)

not sensible or intelligent

fanciful (adjective)

not serious or sensible

fantastic (adjective)

formal not practical or sensible

farcical (adjective)

something that is farcical is so badly organized, unsuccessful, or unfair that it seems silly

fatuous (adjective)

formal stupid

fondly (adverb)

in a way that is not sensible because what you hope or believe is unlikely to be true

foolhardy (adjective)

formal ignoring obvious dangers in a stupid way

give me one good reason ()

used for emphasizing that you do not think there is a good reason for doing something

grandiose (adjective)

intended to achieve something important or difficult, but unlikely to be successful because of not being sensible

grotesque (adjective)

unreasonable, or offensive

harum-scarum (adjective)

informal old-fashioned uncontrolled and not sensible

ill-advised (adjective)

likely to have a bad effect

ill-conceived (adjective)

an ill-conceived idea or plan is not sensible

illogical (adjective)

illogical behaviour, feelings, or actions seem strange because you cannot give good reasons for them

immoderate (adjective)

formal more than is sensible

impractical (adjective)

not sensible, or not likely to be effective or successful

imprudent (adjective)

formal not sensible, especially in relation to the way that money is spent or invested

inadvisable (adjective)

something that is inadvisable is not sensible because it is likely to have bad results

inane (adjective)

completely stupid

intemperate (adjective)

formal unreasonable and showing a lack of control

irrational (adjective)

not thinking or behaving in a clear reasonable way

like an overgrown child/schoolboy/schoolgirl etc ()

looking or behaving like a child, although you are an adult

nonsensical (adjective)

not true, or not sensible

no one in their right mind would do something ()

used for saying that someone would have to be crazy to do something

on/from/living on another planet ()

used for saying that someone does not notice what is happening around them, or has ideas that are not reasonable or practical

ridiculously (adverb)

in a way that seems silly or unreasonable

senseless (adjective)

happening or done for no purpose

starry-eyed (adjective)

someone who is starry-eyed has a lot of hopes or dreams about success in the future, but does not plan things in a sensible way

stars in your eyes ()

if you have stars in your eyes, you are very hopeful and enthusiastic about what is going to happen to you in the future, although this is not a practical or sensible way for you to behave

there’s no call for something ()

used for saying that you think someone is behaving in an unreasonable or rude way

trusting (adjective)

willing to trust people, especially when it is not a sensible thing to do

unjustifiable (adjective)

not right or sensible for any reason

unreasonable (adjective)

used about bad behaviour that you are annoyed about

unsound (adjective)

not based on sensible ideas

unwise (adjective)

formal not sensible

won’t do/wouldn’t do/doesn’t do ()

used for saying that a particular situation or way of behaving is not sensible or suitable

wrong-headed (adjective)

not correct or sensible