Webster's English Dictionary

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portentous

Cross references:
  1. ominous               
 
por.ten.tous \po.r-'tent-*s, po-r-\ aj 1: of, relating to, or constituting 
   a portent  2: eliciting amazement or wonder : PRODIGIOUS  3: 
   self-consciously weighty : POMPOUS  - por.ten.tous.ly av