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thin - definition and synonyms


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adjective thin pronunciation in British English /θɪn/
Word Forms
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  1. 1
    a thin object or material has only a short distance between two opposite sides, edges, or surfaces
    The box was covered with a thin layer of dust.
    There’s a thin crack in the glass.
    Cut the cucumbers and tomatoes into thin slices.
  2. 2
    someone who is thin has very little fat on their body
    Charles was thin and very tall.
    She has been ill and is much too thin.
  3. 4
    a thin liquid contains mostly water, so that it flows easily
    a plate of meat covered with thin gravy
  4. 6
    small in number or amount
    Dexter won by a thin margin (=a small number of votes, points etc).
  5. 8
    thin air has less oxygen in it than usual
    In the mountains, the air is thinner.


derived word


noun [uncountable]
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a course of study which is much shorter than a university course and focuses on the skills you need for a job, especially computer-related skills

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an ancient Roman system of underfloor heating, used to heat houses with hot air; from the Latin 'hypocaustum'

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