solemn

Adjective
  1. Dignified and somber in manner or character and committed to keeping promises (synset 302126493)
    "a grave God-fearing man"; "a quiet sedate nature"; "as sober as a judge"; "a solemn promise"; "the judge was solemn as he pronounced sentence"
    similar to: serious - concerned with work or important matters rather than play or trivialities
    same as: grave, sedate, sober
  2. Characterized by a firm and humorless belief in the validity of your opinions (synset 302126120)
    "both sides were deeply in earnest, even passionate"; "an entirely sincere and cruel tyrant"; "a film with a solemn social message"
    similar to: serious - concerned with work or important matters rather than play or trivialities
    same as: earnest, sincere

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