portentous

Adjective

• puffed up with vanity
  • a grandiloquent and boastful manner
    
  • overblown oratory
    
  • a pompous speech
    
  • pseudo-scientific gobbledygook and pontifical hooey- Newsweek
    

• ominously prophetic

• of momentous or ominous significance
  • such a portentous...monster raised all my curiosity- Herman Melville
    
  • a prodigious vision
    

Related words

• Synonyms: 
  grandiloquent , overblown , pompous , pontifical , fateful , foreboding(a) , prodigious