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( ɪræ ʃənə l )
adjective If you describe someone's feelings and behaviour as irrational , you mean they are not based on logical reasons or clear thinking.
...an irrational fear of science.
Synonyms: illogical, crazy [ informal] , silly, absurd More Synonyms of irrational
irrationally adverb [ ADVERB with verb, ADVERB adjective] The market is behaving irrationally.
Some days I feel irrationally anxious.
irrationality ( ɪræ ʃə næ lɪti ) uncountable noun ...the irrationality of his behaviour. [ + of ]
Synonyms: senselessness , absurdity, lack of judgment , illogicality More Synonyms of irrational
irrational in British English ( ɪˈræʃənə l )
adjective 1. inconsistent with reason or logic; illogical; absurd
2. incapable of reasoning
3. mathematics b. (as noun )
an irrational
4. prosody ( in Greek or Latin verse) a. of or relating to a metrical irregularity, usually the occurrence of a long syllable instead of a short one
b. denoting a metrical foot where such an irregularity occurs
Derived forms
irrationally ( irˈrationally) adverb
irrationalness ( irˈrationalness) noun
irrational in American English ( ɪˈræʃənəl )
adjective 1. lacking the power to reason
2. contrary to reason; senseless; unreasonable; absurd
3. Ancient Mathematics designating a real number not expressible as an integer or as a quotient of two integers: √3 and pi are irrational numbers
see also rational (sense 4) rational (sense 4a) SYNONYMY NOTE: irrational implies mental unsoundness or may be used to stress the utterly illogical natureof that which is directly contrary to reason [ an irrational belief that everybody was his enemy] ; unreasonable implies bad judgment, willfulness, prejudice, etc. as responsible for that whichis not justified by reason [unreasonable demands] OPPOSITES: rational , reasonable
Derived forms
irrationality ( irˌrationˈality) ( ɪrˈræʃəˈnæləti ; ɪˈræʃəˈnæləti) noun Word forms: plural irˌrationˈalities
irrationally ( irˈrationally) adverb
Word origin
ME < L
irrationalis : see in-
2 & rational
Examples of 'irrational' in a sentence irrational
The problem came when the world was tipped upside down and those frameworks were ill-equipped to making sense of behaviours that were irrational. Utterly irrational thoughts of contamination have held him hostage. We then make it worse with our irrational belief that smaller class sizes are vital. Psychiatrists may suggest that my mental illness was a significant factor explaining my irrational behaviour. He has irrational exuberance under his very skin. When people have irrational fears an element of disgust is sometimes involved. These irrational thoughts are called cognitive distortions. His behaviour becomes irrational and he forces her to get into his car with him. At times of irrational exuberance stock valuations become stretched. We all have fears of some kind but some fears are irrational and can disrupt our lives. Fellow workers also have their suspicions because his behaviour is irrational and his productivity erratic. Is irrational fear driving our cultural and political engagement more than it should? But his plans are thwarted by the irrational behaviour of others. But this story also plays into our irrational fears about chemicals. Part of me felt that we needed to delve deeper into why these irrational beliefs had taken hold. Imagine if we could have identified this irrational exuberance at the time by means of a rigorous test. It was totally illogical, irrational and there was the the smell of blood in the air. There is not space here to question the origins of beliefs but overcoming irrational beliefs and expectations is central to managing stress well. Where's the line between irrational exuberance and fraud? He maintains the key to success is managing the inner chimp of fear, emotion and irrational thoughts. Take this irrational belief further. For most women, the alarming thoughts and irrational fears caused by the syndrome pass within days or weeks of giving birth. If your fears are unfounded, your irrational thoughts may stem from an earlier loss, maybe your marriage. In other languages irrational
British English :
irrational ADJECTIVE If you describe someone's feelings and behaviour as irrational , you mean they are not based on logical reasons or clear thinking.
...an irrational fear of science.
American English : irrational Brazilian Portuguese : irracional Chinese : 不理性的 European Spanish : irracional French : irrationnel German : irrational Italian : irrazionale Japanese : 不合理な Korean : 비이성적인 European Portuguese : irracional Latin American Spanish : irracional Chinese translation of 'irrational' adj [feelings, behaviour] 无(無)理性的 (wú lǐxìng de)
Definition
not based on logical reasoning
an irrational fear of science
Synonyms
unsound
unthinking
unreasoning
Opposites
sound
, wise
, reasonable
, sensible
, rational
, logical
, judicious
, circumspect
Additional synonyms Definition
obviously senseless or illogical
They go to absurd lengths just to avoid paying a few pounds.
Synonyms
ridiculous ,
crazy (informal) ,
silly ,
incredible ,
outrageous ,
foolish ,
unbelievable ,
daft (informal) ,
hilarious ,
ludicrous ,
meaningless ,
unreasonable ,
irrational ,
senseless ,
preposterous ,
laughable ,
funny ,
stupid ,
farcical ,
illogical ,
incongruous ,
comical ,
zany ,
idiotic ,
nonsensical ,
inane ,
dumb-ass (slang) ,
cockamamie (slang , US)
Definition
ridiculous
I know it sounds a crazy idea, but hear me out.
Synonyms
ridiculous ,
wild ,
absurd ,
inappropriate ,
foolish ,
ludicrous ,
irresponsible ,
unrealistic ,
unwise ,
senseless ,
preposterous ,
potty (British , informal) ,
short-sighted ,
unworkable ,
foolhardy ,
idiotic ,
nonsensical ,
half-baked (informal) ,
inane ,
fatuous ,
ill-conceived ,
quixotic ,
imprudent ,
impracticable ,
cockeyed (informal) ,
bird-brained (informal) ,
cockamamie (slang , US) ,
porangi (New Zealand)
Definition
very silly, unwise, or absurd
It would be foolish to raise hopes unnecessarily.
Synonyms
unwise ,
silly ,
absurd ,
rash ,
unreasonable ,
senseless ,
short-sighted ,
ill-advised ,
foolhardy ,
nonsensical ,
inane ,
indiscreet ,
ill-judged ,
ill-considered ,
imprudent ,
unintelligent ,
asinine ,
injudicious ,
incautious
Additional synonyms What an idiotic thing to say!
Synonyms
foolish ,
crazy ,
stupid ,
dumb (informal) ,
daft (informal) ,
senseless ,
foolhardy ,
inane ,
fatuous ,
loopy (informal) ,
crackpot (informal) ,
unintelligent ,
asinine ,
harebrained ,
dumb-ass (slang) ,
halfwitted Definition
showing poor judgment
Injudicious remarks by bankers were blamed for the devaluation.
Synonyms
unwise ,
foolish ,
rash ,
hasty ,
ill-advised ,
indiscreet ,
unthinking ,
ill-judged ,
imprudent ,
inconsiderate ,
ill-timed ,
incautious ,
impolitic ,
inexpedient It seemed to me that Sir Robert's arguments were nonsensical.
Synonyms
senseless ,
crazy (informal) ,
silly ,
ridiculous ,
absurd ,
foolish ,
ludicrous ,
meaningless ,
irrational ,
incomprehensible ,
inane ,
asinine ,
cockamamie (slang , US)
Definition
utterly absurd
The whole idea was preposterous.
Synonyms
ridiculous ,
bizarre ,
incredible ,
outrageous ,
shocking ,
impossible ,
extreme ,
crazy (informal) ,
excessive ,
absurd ,
foolish ,
ludicrous ,
extravagant ,
unthinkable ,
unreasonable ,
irrational ,
monstrous ,
senseless ,
out of the question ,
laughable ,
exorbitant ,
nonsensical ,
risible (formal) ,
asinine ,
cockamamie (slang , US)
Definition
behaving in a foolish or childish way
Don't go doing anything silly, now, will you?
Synonyms
foolish ,
stupid ,
unwise ,
inappropriate ,
rash ,
irresponsible ,
reckless ,
foolhardy ,
idiotic ,
thoughtless ,
imprudent ,
inadvisable Definition
unfair and excessive
unreasonable increases in the price of petrol
Synonyms
excessive ,
steep (informal) ,
exorbitant ,
unfair ,
absurd ,
extravagant ,
unjust ,
too great ,
undue ,
preposterous ,
unwarranted ,
far-fetched ,
extortionate ,
uncalled-for ,
immoderate Definition
foolish
It would be unwise to expect too much.
Synonyms
foolish ,
stupid ,
silly ,
rash ,
irresponsible ,
reckless ,
senseless ,
short-sighted ,
ill-advised ,
foolhardy ,
inane ,
indiscreet ,
ill-judged ,
ill-considered ,
imprudent ,
inadvisable ,
asinine ,
injudicious ,
improvident ,
impolitic