Definition of sober adjective from the Oxford Advanced Learner's Dictionary

     

    sober

     adjective
    adjective
    BrE BrE//ˈsəʊbə(r)//
     
    ; NAmE NAmE//ˈsoʊbər//
     
    Describing clothes
     
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  1. 1[not usually before noun] not drunk (= not affected by alcohol) I promised him that I'd stay sober tonight. He was as sober as a judge (= completely sober).
  2. 2(of people and their behaviour) serious and sensible a sober assessment of the situation He is honest, sober and hard-working. On sober reflection (= after some serious thought), I don't think I really need a car after all.
  3. 3(of colours or clothes) plain and not bright a sober grey suit See related entries: Describing clothes
  4. Word Origin Middle English: from Old French sobre, from Latin sobrius.Extra examples By this time he felt more or less sober again. I’ve been clean and sober for four years. Only the thought of her kept him sober. She wanted a drink, but she had to stay sober. He was honest, sober and hardworking. I promised him that I’d stay sober tonight. On sober reflection I have decided to drop the case. We need to make a calm, sober assessment of the situation.
See the Oxford Advanced American Dictionary entry: sober