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WordNet-Online 
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Adjective grave has 3 senses
- grave, sedate, sober, solemn - 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"
 
Antonym:  frivolous (indirect, via serious) 
 - dangerous, grave, grievous, serious, severe, life-threatening - causing fear or anxiety by threatening great harm; "a dangerous operation"; "a grave situation"; "a grave illness"; "grievous bodily harm"; "a serious wound"; "a serious turn of events"; "a severe case of pneumonia"; "a life-threatening disease"
 
Antonyms:  noncritical, noncrucial (indirect, via critical) 
 - grave, grievous, heavy, weighty - of great gravity or crucial import; requiring serious thought; "grave responsibilities"; "faced a grave decision in a time of crisis"; "a grievous fault"; "heavy matters of state"; "the weighty matters to be discussed at the peace conference"
 
Antonym:  unimportant (indirect, via important) 
  
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