half-asleep

IPA/hˈɑːfɐslˈiːp/
IPA/hˈæfɐslˈiːp/

half-asleep — adjective

1. in a state between sleeping and being awake, when tiredness makes it hard to thi

1.adjectiveB1
Definition

in a state between sleeping and being awake, when tiredness makes it hard to think clearly or notice what is happening around you

Example

Nadia was still half-asleep when her alarm went off at six in the morning.

be + still half-asleep + when-clause

Stefan answered the door in a half-asleep voice and forgot to ask who was calling.

in a half-asleep [noun] — describes voice or manner

Common collocations
  • still half-asleep
  • half-asleep daze
  • half-asleep voice
  • barely half-asleep
  • half-asleep state
Synonyms
  • drowsy

    slightly more formal and often implies a tendency to fall asleep rather than being caught between sleeping and waking

  • groggy

    includes a sense of confusion or unsteadiness that 'half-asleep' does not always carry

  • sleepy

    broader term that can describe the feeling before falling asleep, not just the liminal state

Antonyms
  • wide awake

    completely alert and aware, opposite end of the wakefulness spectrum

  • alert

    fully attentive and ready to respond

Grammar Patterns

be + half-asleep

still + half-asleep

half-asleep + noun

Usage Note

Often used with 'still' (still half-asleep) when describing someone who has just woken up. Can appear before a noun to describe a person's voice, manner, or state (a half-asleep daze, a half-asleep reply). More common in spoken than in formal written English.

Common Mistakes

I was half-asleep during the movie because it was so boring.
I was half-asleep during the movie because I had not slept well.
'half-asleep' describes physical tiredness, not boredom. Use 'drowsy' or 'bored' for reactions caused by lack of interest.
I am half-asleep today because of my headache.
I feel half-asleep today because of my headache.
As a descriptive state, 'feel half-asleep' is more natural than 'am half-asleep' in many contexts, though 'am half-asleep' is also grammatically correct.

Synonym discussion

Sense: adjective/1

'Half-asleep' describes the specific liminal state between sleeping and waking — you are aware of some sounds or movements but cannot respond quickly or think clearly. 'Drowsy' (more formal) is the feeling of wanting to sleep, often from medication or a warm environment, but you are still fully conscious. 'Groggy' adds unsteadiness and confusion — you might feel groggy after being woken suddenly from deep sleep. 'Sleepy' is the broadest term, covering any degree of tiredness where sleep seems attractive. 'Dozy' (British, informal) suggests a light, pleasant drowsiness rather than exhaustion. Use 'half-asleep' when you want to emphasise the in-between, low-awareness moment: 'I was half-asleep when the phone rang and I knocked over my glass of water.'

drowsy ↗groggy ↗sleepy ↗dozy ↗

Etymology

Old EnglishMiddle EnglishEnglish

Formed by combining the adverb 'half' (meaning partially or incompletely) with the adjective 'asleep', which traces back to Old English 'on slæpe' (on sleep). The compound 'half-asleep' has been used since at least the 16th century to describe the transitional state between sleeping and waking.