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serious (EN)
adjective

adjective “serious”

base form serious (more/most)
  1. significant and possibly with bad consequences
    The doctor said the injury is serious and needs immediate attention.
  2. sincere; not joking
    Believe me, I was serious when I mentioned the deadline.
  3. mature; not silly
    Can you be serious now, please?
  4. (of media) requiring careful thought, not just for fun
    The doctor gave me a serious warning about my health.
  5. (of a relationship) committed and dedicated to each other
    They have been dating for two years and are now in a serious relationship.
  6. (informal) used to emphasize that there is a lot of something
    She has a serious collection of vintage records.