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Adjective: portentous  por'ten-tus
  1. Of momentous or ominous significance
    "such a portentous...monster raised all my curiosity";
    - prodigious
     
  2. Ominously prophetic
    - fateful, foreboding
     
  3. Puffed up with vanity
    "a portentous and boastful manner";
    - grandiloquent, overblown, pompous, pontifical

See also: important, pretentious, prophetic, prophetical, significant

Nearest

portal tomb
portal vein
portamento
portative
Port-au-Prince
portcullis
Porte
porte-cochère
portend
portent
portentous
portentously
porter
Porter
porterage
porterhouse
porterhouse steak
porter's beer
portfolio
porthole
Portia