serious

/ˈsir-ē-əs/

Middle English seryows, from Anglo-French or Late Latin; Anglo-French serious, from Late Latin seriosus, alteration of Latin serius weighty, serious; probably akin to Old English swǣr heavy, sad

adjective

  1. thoughtful or subdued in appearance or manner : sober

  2. requiring much thought or work

  3. of or relating to a matter of importance

a quiet, serious girl

serious grave solemn sedate staid sober earnest mean not light or frivolous. serious implies a concern for what really matters. grave implies both seriousness and dignity in expression or attitude.

adjective

  1. having a serious disposition or trend of thought

idiom

  1. —used to express disbelief about what someone said