monumental

Adjective
  1. Relating or belonging to or serving as a monument (synset 302875447)
    "the use of the arch in monumental architecture"; "monumental sculptures"
  2. Of outstanding significance (synset 302170883)
    "Einstein's monumental contributions to physics"
    similar to: important, significant - important in effect or meaning
  3. Imposing in size or bulk or solidity (synset 301392104)
    "massive oak doors"; "Moore's massive sculptures"; "the monolithic proportions of Stalinist architecture"; "a monumental scale"
    similar to: big, large - above average in size or number or quantity or magnitude or extent
    same as: massive, monolithic

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