This adjective means the opposite of playful or drunk. When attending a funeral, you are expected to be sober in both senses.

The most common meaning of sober is "not drunk" — people who drive need to be sober. Sober sounds a lot like somber, and it often means sad and quiet too, or sometimes too serious. Another meaning is to be logical or realistic about something. Sometimes sober means drab: a grey station wagon is a more sober vehicle than a hot red convertible. All of these meanings are quiet and restrained — unlike a person who has had a lot to drink.

Definitions of sober
  1. adjective
    not affected by a chemical substance (especially alcohol)
    cold sober, stone-sober
    totally sober
    characteristic of a person not taking illegal drugs or of a place where no illegal drugs are used
    dry, teetotal
    practicing complete abstinence from alcoholic beverages
    uninebriated, unintoxicated
    not inebriated
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    drunk, inebriated, intoxicated
    stupefied or excited by a chemical substance (especially alcohol)
    bacchanal, bacchanalian, bacchic, carousing, orgiastic
    used of riotously drunken merrymaking
    smelling of beer
    very drunk
    slightly intoxicated
    bibulous, boozy, drunken, sottish
    given to or marked by the consumption of alcohol
    drugged, narcotised, narcotized
    under the influence of narcotics
    British informal for `intoxicated'
    high, mellow
    slightly and pleasantly intoxicated from alcohol or a drug (especially marijuana)
    hopped-up, stoned
    under the influence of narcotics
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  2. adjective
    lacking brightness or color; dull
    sober Puritan grey”
    synonyms: drab, somber, sombre
    colorless, colourless
    weak in color; not colorful
  3. adjective
    dignified and somber in manner or character and committed to keeping promises
    “as sober as a judge”
    synonyms: grave, sedate, solemn
    concerned with work or important matters rather than play or trivialities
  4. adjective
    completely lacking in playfulness
    synonyms: serious, unplayful
    see moresee less
    full of fun and high spirits
    coltish, frolicky, frolicsome, rollicking, sportive
    given to merry frolicking
    devilish, rascally, roguish
    playful in an appealingly bold way
    elfin, elfish, elvish
    usually good-naturedly mischievous
    arch, impish, implike, mischievous, pixilated, prankish, puckish, wicked
    naughtily or annoyingly playful
    frisky, kittenish
    playful like a lively kitten
    mocking, quizzical, teasing
    playfully vexing (especially by ridicule)
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  5. verb
    become sober after excessive alcohol consumption
    synonyms: sober up
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    type of:
    become, get, go, wax
    enter or assume a certain state or condition
  6. verb
    cause to become sober
    “A sobering thought”
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    type of:
    alter, change, modify
    cause to change; make different; cause a transformation
  7. verb
    become more realistic
    “After thinking about the potential consequences of his plan, he sobered up”
    synonyms: sober up
    see moresee less
    type of:
    become, get, go, wax
    enter or assume a certain state or condition
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