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ir·ra·tion·al
 irrational
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- pronunciation:
- ih
rae
sh
nl
- features:
- Word Combinations (adjective), Word Explorer, Word Parts
| part of speech: |
adjective |
| definition 1: |
lacking in reason, sense, or judgment.
He had drunk too much whiskey and was now irrational.She had an irrational impulse to jump off the bridge.When his wife went out with her friends, he felt an irrational jealousy.- synonyms:
- foolish, unreasonable, unwise
- antonyms:
- rational, reasonable, thinking
- similar words:
- absurd, addlebrained, blind, daffy, daft, fantastic, half-baked, idiotic, ill-advised, inane, mad, nonsensical
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| definition 2: |
not based on logical reasoning; illogical.
This paper presents an irrational argument.- synonyms:
- absurd, fallacious, illogical, invalid, unreasonable, unsound, untenable
- antonyms:
- logical, rational, reasonable
- similar words:
- erroneous, incredible, preposterous, ridiculous, specious, unscientific
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| definition 3: |
in mathematics, not capable of being expressed as a whole number or as a ratio of two whole numbers.
The square root of two is an irrational number. |
| related words: |
arbitrary, groundless, neurotic, senseless, stupid, unsound, wanton |
adverb + (adj.)irrational
completely, deeply, economically, entirely, equally, essentially, fundamentally, hence, increasingly, inherently, neither, seemingly, totally, utterly
(adj.)irrational
+ adverb
potentially, somehow
(adj.)irrational
+ noun
act,
anger,
anxiety,
assumption,
attraction,
behavior,
belief,
bigotry,
certainty,
claim,
compulsion,
desire,
discrimination,
dislike,
distinction,
emotion,
exuberance,
fear,
guilt,
hatred,
homosexual,
hope,
hostility,
hysteria,
impulse,
investor,
jealousy,
myth,
notion,
obsession,
optimism,
outburst,
panic,
passion,
prejudice,
racism,
rage,
scheme,
sexuality,
suicide,
surge,
suspicion,
swing,
tendency,
terror,
therapy,
thinking,
thought,
wickedness,
worry
[See all][See only the most frequent]
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| derivations: |
irrationally (adv.), irrationality (n.), irrationalness (n.) |
The word irrational
contains the following part:
-al2, -ial, -ual
Latin
adjective-forming suffix
that means pertaining to
  More about this word part:
The suffix -al2, -ial
attaches primarily to nouns ( national
, environmental
) but sometimes to Latin or Greek roots ( final
, capital
, comical
) to form adjectives. See also -ar1.
Example words:
abnormal, accidental, additional, aerial, agricultural, ancestral, annual, arboreal, artificial, astral, bacterial, biblical, biographical, brutal, capital, central, ceremonial, chemical, classical, clinical, coastal, colonial, comical, commercial, confidential, constitutional, continental, continual, controversial, conventional, criminal, critical, crucial, cultural, cylindrical, dental, detrimental, developmental, economical, editorial, educational, electrical, emotional, environmental, essential, equal, exceptional, experimental, facial, factual, federal, final, financial, floral, fluvial, formal, functional, fundamental, general, global, grammatical, guttural, habitual, historical, hysterical, illogical, immoral, impersonal, impractical, individual, industrial, ineffectual, influential, internal, legal, local, logical, lyrical, magical, maniacal, mathematical, memorial, mental, moral, mortal, musical, mythical, national, natural, nautical, neutral, normal, official, parental, pastoral, personal, philosophical, plural, pluralism, pluralistic, political, potential, quizzical, racial, rational, regional, irrational, intellectual, rhythmical, sacrificial, seasonal, spinal, spiritual, technological, territorial, theatrical, thermal, tidal, traditional, tribal, typical, universal, unnatural, veridical, verbal, virtual, vocal, visual
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