--adj.

1. dignified and somber in manner or character and committed to keeping promises.
  • "A solemn promise."
2. characterized by a firm and humorless belief in the validity of your opinions.
  • "A film with a solemn social message."
early 14c., from Old French solempne, from Latin sollemnis "formal, ceremonial, traditional", perhaps related to sollus "whole."
How to use "sol·emn"?
Awful should not be used of things which are merely disagreeable or annoying, nor of all that are alarming and terrible, but only of such as bring a solemn awe upon the soul, as in the presence of a superior power: the awful hush before the battle. That which is awful arouses an oppressive, that which is august an admiring reverence; we speak of the august presence of a mighty monarch, the awful presence of death. We speak of an exalted station, a grand mountain, an imposing presence, a majestic cathedral, a noble mien, a solemn litany, a stately march, an august assembly, the awful scene of the Judgment Day.
Synonyms
  • alarming - frightening because of an awareness of danger.
  • direful - causing fear or dread or terror. "A career or vengeance so direful that London was shocked."
  • frightful - provoking horror. "A frightful crime of decapitation."
  • majestic - majestic in manner or bearing; superior to mundane matters. "His majestic presence."
  • solemn - dignified and somber in manner or character and committed to keeping promises. "A solemn promise."
  • appalling - causing consternation. "Appalling conditions."
  • dread - to be afraid or scared of; to be frightened of.
  • grand - of behavior that is impressive and ambitious in scale or scope. "In the grand manner."
  • noble - impressive in appearance. "A noble tree."
  • stately - impressive in appearance. "Stately columns."
  • august - the month following July and preceding September.
  • dreadful - causing fear or dread or terror. "A dreadful storm."
  • horrible - provoking horror. "War is beyond all words horrible."
  • portentous - of momentous or ominous significance. "Such a portentous...monster raised all my curiosity."
  • terrible - causing fear or dread or terror. "A terrible curse."
  • dire - fraught with extreme danger; nearly hopeless. "A dire emergency."
  • fearful - experiencing or showing fear. "A fearful glance."
  • imposing - impressive in appearance. "An imposing residence."
  • shocking - giving offense to moral sensibilities and injurious to reputation. "The most shocking book of its time."
Antonyms
  • base - to use as a basis for; to found on. "Base a claim on some observation."
  • contemptible - deserving of contempt or scorn.
  • inferior - having an orbit between the sun and the Earth's orbit. "Mercury and Venus are inferior planets."
  • paltry - not worth considering. "He considered the prize too paltry for the lives it must cost."
  • beggarly - marked by poverty befitting a beggar. "A beggarly existence in the slums."
  • despicable - morally reprehensible. "Would do something as despicable as murder."
  • lowly - low or inferior in station or quality. "A lowly parish priest."
  • undignified - lacking dignity.
  • commonplace - completely ordinary and unremarkable. "Air travel has now become commonplace."
  • humble - low or inferior in station or quality. "A humble cottage."
  • mean - to mean or intend to express or convey. "You never understand what I mean!."