sɪˈdeɪt səˈdeɪt sɪnˈsɪə(ɹ) ˈsəʊ.bə(ɹ) ˈsɒləm ˈsɑləm characterized by a firm and humorless belief in the validity of your opinions both sides were deeply in earnest, even passionate an entirely sincere and cruel tyrant a film with a solemn social message dignified and somber in manner or character and committed to keeping promises 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