portentous
(en)
(adjective) of, relating to, or constituting a portent / (adjective) eliciting amazement or wonder; prodigious / (adjective) being a grave or serious matter / (adjective) self-consciously solemn or important; pompous / (adjective) ponderously excessive
the United States in 1867 took a portentous forward step in democracy
notable
8 months, 2 weeks ago