oblivious

oblivious — adjective

1. completely failing to notice or pay attention to what is going on around you, of

1.adjectiveC1
Definition

completely failing to notice or pay attention to what is going on around you, often because your mind is fixed on something else.

Example

Maya walked into the lamp post, completely oblivious to the laughing tourists nearby.

oblivious to + noun (people / surroundings)

The toddler kept singing in the supermarket, oblivious of the curious shoppers around her.

oblivious of + noun (less common variant)

Common collocations
  • blissfully oblivious
  • completely oblivious
  • seemingly oblivious
  • remain oblivious to
  • oblivious to the danger
  • oblivious to the fact that
Synonyms
  • unaware

    neutral and more common; doesn't suggest the strong, almost surprising blindness that 'oblivious' does

  • heedless

    formal; emphasises ignoring warnings or risks rather than simply not noticing

  • unconscious

    stronger; often used for someone literally not processing reality, e.g. asleep or drugged

  • inattentive

    milder; suggests momentary lack of focus rather than total unawareness

Antonyms
  • aware

    the most direct opposite; neutral register

  • conscious

    stresses that the person is mentally processing what is happening

  • alert

    adds the idea of being ready to react, not just noticing

Grammar Patterns

oblivious to + noun

oblivious of + noun

be oblivious that + clause

Usage Note

Almost always predicative (after 'be', 'seem', 'remain') — rarely placed before a noun. Frequently paired with adverbs like 'blissfully', 'happily', or 'completely' to stress the speaker's surprise that the person didn't notice.

Common Mistakes

She is an oblivious driver to road signs.
She is a driver who is oblivious to road signs.
'oblivious' is awkward in front of a noun; place it after a linking verb.
He was oblivious about the danger.
He was oblivious to the danger.
the standard preposition is 'to' (or, more formally, 'of'), not 'about'.

Word family

  • oblivion
    nounC2
  • obliviously
    adverbC1
  • obliviousness
    nounC2

Synonym discussion

Sense: adjective/1

All four words describe not knowing something, but the focus differs. 'Unaware' is the everyday, neutral choice — you simply don't have the information ('She was unaware of the meeting time'). 'Oblivious' is stronger and more vivid: it pictures someone whose attention is so absorbed elsewhere that the world around them slips by, often to a comic or worrying degree ('He kept tapping his phone, oblivious to the queue forming behind him'). 'Heedless' is formal and carries a hint of blame — the person should have paid attention to a warning or risk ('heedless of the doctor's advice'). 'Ignorant' shifts the meaning: it's about lacking knowledge or facts, not about failing to notice the present moment ('ignorant of basic chemistry'). Pick 'oblivious' when the surprise is that the person didn't register what was happening right in front of them.

oblivious ↗unaware ↗heedlessignorant ↗

Common collocations

Nouns

Adverbs

Phrases

  • remain oblivious
  • appear oblivious
  • blissfully oblivious to

Prepositions

Etymology

LatinMiddle FrenchEnglish

Borrowed into English in the late 1400s from Latin 'obliviosus', meaning 'forgetful', built on 'oblivio' ('forgetting'). For most of its history the word centred on memory — describing things or people that bring on, or suffer from, forgetfulness. The modern meaning of 'failing to notice what is right in front of you' grew out of that idea in the 1800s and is now by far the dominant sense in everyday English.