Did you know?

Click any word in a definition or example to find the entry for that word

lost - definition and synonyms

What are red words?

90% of the time, speakers of English use just 7,500 words in speech and writing. These words appear in red, and are graded with stars. One-star words are frequent, two-star words are more frequent, and three-star words are the most frequent.

Thesaurus diagram

The thesaurus of synonyms and related words is fully integrated into the dictionary. Click on the thesaurus category heading under the button in an entry to see the synonyms and related words for that meaning.

adjective     lost pronunciation in British English
  1. 1
    not knowing where you are or how to get to where you want to go

    We’re well and truly lost.

    get lost:

    They decided to drive to York and ended up getting lost.

  2. 2
    if something is lost, you cannot find it

    The keys are lost somewhere in the house.

  3. 3
    [only before noun] no longer existing, or no longer likely to exist

    The strike has cost the airline £3 million in lost revenue.

    a poem about lost innocence

  4. 4
    lost time or chances have been wasted

    The team’s season has been littered with missed opportunities and lost chances.

  5. 5
    [not usually before noun] not feeling confident or relaxed because you are in a new situation, for example with a group of people who you do not know

    Mark looked a little lost amongst all those trendy designers.

    Nothing was the same any more. I felt lost.

  6. 6
    completely destroyed

    The group is working to preserve old buildings that could otherwise be lost.

  7. 7
    killed, especially while fighting in the armed forces
    lost in battle:

    a memorial to all soldiers lost in battle

    lost at sea:

    a ceremony to commemorate those lost at sea in the Second World War

    Synonyms and related words
  8. 8
    [never before noun] too interested in something, or concentrating so hard on it, that you do not notice other things around you
    lost in something:

    Grayson became lost in the music.

    lost in thought:

    Martin was lost in thought and did not hear the door open.

    lost to the world:

    Look at them watching their video. Completely lost to the world!

  9. 9
    [never before noun] unable to understand something because it is extremely complicated

    I was completely lost after the first paragraph.

  • Facebook
  • Twitter


a lifestyle focussing on simple pleasures such as comfort and cosiness in the home, and spending time with friends and family

BuzzWord Article

Open Dictionary


a form of location that involves the underwater detonation of a bomb which causes sound waves that are picked up by ships

add a word


A must for anyone with an interest in the changing face of language. The Macmillan Dictionary blog explores English as it is spoken around the world today.

global English and language change from our blog
Macmillan learn live love play