inconceivably

IPA/ˌɪnkənˈsiːvəbli/
IPA/ˌɪnkənˈsiːvəbli/

inconceivably — adverb

1. To such a strong degree that the human mind cannot form a clear picture of it or

1.adverbC1
Definition

To such a strong degree that the human mind cannot form a clear picture of it or accept it as real — used when something goes far beyond what one can normally imagine.

Example

The palace was inconceivably grand, with more than five hundred rooms and a private theatre.

inconceivably + adjective (grand) for degree of size

Constanza found the pain after her surgery inconceivably intense, despite the strongest medicine.

find + object + inconceivably + adjective

Common collocations
  • inconceivably large
  • inconceivably vast
  • inconceivably complex
  • inconceivably beautiful
Synonyms
  • unimaginably

    nearly identical in meaning; more common in everyday writing

  • unbelievably

    less formal; can express surprise rather than impossibility of imagining

  • incredibly

    very common in informal speech; weaker emotional weight

Antonyms
  • conceivably

    the direct opposite; suggests something is possible to imagine

Grammar Patterns

inconceivably + adjective

verb + inconceivably

Usage Note

Often modifies adjectives that describe scale, intensity, or beauty (vast, enormous, beautiful, complex). The modified word must already carry the idea of extremity — adding inconceivably pushes it beyond the ordinary limit.

Common Mistakes

The coffee was inconceivably hot.' (hot is too ordinary for this modifier)
The coffee was unbelievably hot.
Inconceivably is used for things that stretch the imagination, not everyday sensations.

2. At a level of improbability so high that something almost certainly cannot happe

2.adverbC1
Definition

At a level of improbability so high that something almost certainly cannot happen or is not true.

Example

It is inconceivably rare for a small business to grow into a global company without outside money.

inconceivably + rare (probability adjective)

The chance of a single ticket matching all six numbers is inconceivably small.

chance ... is inconceivably + small

Common collocations
  • inconceivably rare
  • inconceivably unlikely
  • inconceivably small chance
  • inconceivably low odds
Synonyms
  • impossibly

    slightly stronger; suggests the thing cannot happen at all, not just very unlikely

  • unimaginably

    works for both scale and probability; slightly broader

  • incredibly

    less formal; weaker in degree of unlikelihood

Antonyms
  • quite possibly

    conveys a realistic chance rather than extreme unlikelihood

Grammar Patterns

inconceivably + adjective of probability

it is inconceivably + adjective + that-clause

Usage Note

Strongly associated with probability vocabulary: rare, unlikely, small, low, slim. The that-clause pattern (it is inconceivably + adjective + that...) appears mostly in formal or written English.

Common Mistakes

I am inconceivably tired.
I am incredibly tired.
Inconceivably is for probability and scale, not personal states.

inconceivably — adjective

Word family

Synonym discussion

Sense: adjective/1

All four describe experiences or ideas that the mind cannot easily handle, but they differ in what kind of difficulty they highlight. Unimaginable is the closest match to inconceivable and focuses on the inability to form a mental picture: the size of the universe or life without electricity is unimaginable. Unthinkable carries a stronger moral or emotional weight — betraying a close friend or committing a terrible crime is unthinkable because the idea should not even be considered. Unfathomable suggests a depth that cannot be measured or fully explored, like the mystery of the ocean floor or the meaning of an ancient poem. Incomprehensible points specifically to intellectual failure: a book written in an unknown language or a complex physics equation is incomprehensible. Choose unimaginable for neutral impossibility of imagining, unthinkable for something morally wrong, unfathomable for deep mysteries, and incomprehensible for intellectual difficulty.

unimaginable ↗unthinkable ↗unfathomable ↗incomprehensible ↗

Common collocations

Nouns

Adverbs

Phrases

  • in a way that ...
  • it is inconceivable that ...
  • find something inconceivable

Prepositions

Etymology

LatinFrenchEnglish

Formed from the Latin prefix in- (not) combined with concipio (to take in, grasp, conceive). From Latin inconceivabilis the word passed into French as inconcevable, then entered English in the 17th century with the meaning 'that cannot be imagined.' The adverb form inconceivably appeared later, following the common English pattern of adding -ly to an adjective.

First known use

1624

1624, in the meaning defined above