unconscious

unconscious — adjective

1. when you are not awake and cannot see, hear, or feel what is happening around yo

1.adjectiveB1
Definition

when you are not awake and cannot see, hear, or feel what is happening around you, often after a blow to the head, a serious illness, or during an operation.

Example

The paramedics found Bilal unconscious on the kitchen floor.

passive: found + person + unconscious

After the crash, Chiara remained unconscious for nearly three days.

collocation: remained unconscious

Common collocations
  • knocked unconscious
  • found unconscious
  • remain unconscious
  • lay unconscious
  • still unconscious
Synonyms
Antonyms
  • conscious

    awake and aware of surroundings

  • alert

    fully awake and paying attention

Grammar Patterns

be/become/remain/lie unconscious

knock/find somebody unconscious

Usage Note

Typically used predicatively — after a linking verb like 'be', 'remain', 'lie', 'fall', or with a verb like 'find' or 'knock'. Attributive use ('an unconscious patient') is possible in medical writing but less common in everyday English.

Common Mistakes

After the hit, he was unconscious of everything.
After the hit, he was unconscious.
'unconscious of' means 'not aware' (sense 3), not 'physically unresponsive.'

2. describing a thought, feeling, habit, or action that happens without your awaren

2.adjectiveB2
Definition

describing a thought, feeling, habit, or action that happens without your awareness or deliberate intention — for example, tapping your foot without realizing, or holding a bias you would not consciously agree with.

Example

Mira had an unconscious habit of twisting her hair while reading.

collocation: unconscious habit

Many people hold unconscious biases about others without realizing it.

collocation: unconscious bias

Common collocations
  • unconscious habit
  • unconscious bias
  • unconscious gesture
  • unconscious thought
  • unconscious sigh
Synonyms
Antonyms

Grammar Patterns

unconscious + noun (thought, feeling, habit, bias, gesture)

Usage Note

Used attributively before nouns that describe mental events or physical actions. Distinguish from sense 1 (NOT AWAKE) — sense 1 describes a medical state of being physically unresponsive; sense 2 describes everyday mental processes that happen without your awareness.

Common Mistakes

She was unconscious of her bad habit.
She had an unconscious habit of biting her nails.
'unconscious of' belongs to sense 3 (UNAWARE); for sense 2, place 'unconscious' before the noun.

3. not having knowledge or awareness of something that is happening or exists — for

3.adjectiveB2
Definition

not having knowledge or awareness of something that is happening or exists — for example, not noticing that you are being watched, or not realizing you are humming loudly.

Example

Kenji seemed completely unconscious of the noise around him.

pattern: unconscious OF [something]

The children were unconscious of the danger as they played near the busy road.

Common collocations
  • unconscious of
  • unconscious of the fact
  • completely unconscious of
  • seemingly unconscious of
Synonyms
  • unaware

    more common in everyday English; same meaning

  • oblivious

    stronger; suggests complete lack of attention

  • ignorant

    negative connotation; lacking knowledge

  • heedless

    formal; suggests careless disregard

Antonyms

Grammar Patterns

unconscious of + noun/gerund/clause

Usage Note

Always followed by 'of' + noun, gerund, or a clause. Distinguish from sense 2 (NOT DELIBERATE) — sense 3 describes a lack of awareness about external facts or situations, not internal mental processes. Common in formal writing; 'not aware' is more natural in everyday conversation.

Common Mistakes

He was unconscious to the warning signs.
He was unconscious of the warning signs.
'unconscious' takes the preposition 'of', not 'to.'
She was unconscious about her mistake.
She was unconscious of her mistake.
Use 'of' after 'unconscious,' not 'about.'

unconscious — noun

Word family

Synonym discussion

Sense: adjective/1

All four describe a state of being unaware and unresponsive, but they differ in cause and tone. 'Unconscious' (sense 1) is the neutral, medical term used for any loss of awareness — from fainting to brain injury. 'Passed out' is informal and usually suggests a brief loss of consciousness from fainting, exhaustion, or drinking too much alcohol. 'Knocked out' is also informal but specifically describes losing consciousness from a physical blow to the head, common in boxing, fights, or accidents. 'Comatose' is a strict medical term for a prolonged, deep state of unconsciousness caused by severe brain damage, and using it outside medical contexts can sound dramatic or exaggerated. Example: 'After the collision, the driver was unconscious for ten minutes — he hadn't simply passed out from shock; he was knocked out by the impact.'

unconscious ↗passed outknocked outcomatose

Common collocations

Nouns

Adverbs

Phrases

  • knocked unconscious
  • found unconscious
  • the unconscious

Prepositions

Etymology

LatinFrenchEnglish

Formed in English in the early 1700s from the prefix 'un-' (meaning 'not') and 'conscious', which comes from Latin 'conscius' (con- 'with' + scire 'to know'). The psychological noun sense — 'the unconscious' as a hidden part of the mind — became popular in the late 1800s through the work of Sigmund Freud and Carl Jung, translating the German 'das Unbewusste'.