Standard Lemma guide

unreason

noun · verb · 6 senses · updated from the 2026-07-25 local source snapshot

Definitions and examples are grouped by meaning. Pronunciation, history, word forms, translations, descendants, synonyms, antonyms, derived terms, and related words appear whenever the source provides them.

Sound

Pronunciation

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1

noun

Meaning 1

Lack of reason or rationality; unreasonableness; irrationality.

Definition source: English Wiktionary via Wiktextract

Usage: uncountable, usually

Examples

  • c. 1566, John Knox, The Historie of the Reformation of the Church of Scotland, Book I, London: 1644, Another day the same Frier made another Sermon of the Abbot of Unreason, unto whom, and whose Laws, he compareth Prelats of that age; for they were subject to no Laws, no more than was the Abbot of Unreason.
  • 1937, Robert Byron, The Road to Oxiana, “Shiraz, 18 February,” Of all the foreigners I have met in this country, diplomats, business men, and archaeologists of many nationalities and varying terms of residence, Christopher is the only one who likes its inhabitants, sympathizes with their nationalist growing-pains, and consistently upholds their virtues, sometimes to the point of unreason.

Meaning relationships

Synonyms: none provided

Antonyms: none provided

2

noun

Meaning 2

Nonsense; folly; absurdity.

Definition source: English Wiktionary via Wiktextract

Usage: uncountable, usually

No example sentence was provided for this meaning.

Meaning relationships

Synonyms: none provided

Antonyms: none provided

3

verb

Meaning 3

To prove to be unreasonable; disprove by argument.

Definition source: English Wiktionary via Wiktextract

Usage: rare, transitive

No example sentence was provided for this meaning.

Meaning relationships

Synonyms: none provided

Antonyms: none provided

4

verb

Meaning 4

To apply false logic or think without logic.

Definition source: English Wiktionary via Wiktextract

Usage: rare

No example sentence was provided for this meaning.

Meaning relationships

Synonyms: none provided

Antonyms: none provided

5

verb

Meaning 5

To make unreasonable; to deprive of reason.

Definition source: English Wiktionary via Wiktextract

Usage: rare

No example sentence was provided for this meaning.

Meaning relationships

Synonyms: none provided

Antonyms: none provided

6

noun

Meaning 6

the state of being irrational; lacking powers of understanding

Definition source: Princeton WordNet 3.0

No example sentence was provided for this meaning.

Meaning relationships

Synonyms: irrationality

Antonyms: none provided

Broader terms: insanity

History

Etymology

From Middle English unreson; equivalent to un- + reason.

Across languages

Translations

11 source translations are retained for this English entry.

  • Bulgarian: безумие (bezumie) — lack of reason
  • Esperanto: malracieco — lack of reason
  • German: Unvernunft — lack of reason
  • Irish: aingiall — lack of reason
  • Irish: éigiall — lack of reason
  • Irish: míréasún — lack of reason
  • Polish: bezrozum — lack of reason
  • Polish: bezrozumność — lack of reason
  • Bulgarian: глупост (glupost) — nonsense, folly
  • French: déraison — nonsense, folly
  • German: Torheit — nonsense, folly
Real reading context

unreason in complete knowledge articles