massive, monolithic, monumental -- (imposing in size or bulk or solidity; "massive oak doors"; "Moore's massive sculptures"; "the monolithic proportions of Stalinist architecture"; "a monumental scale")
massive -- (being the same substance throughout; "massive silver")
massive -- (imposing in scale or scope or degree or power; "massive retaliatory power"; "a massive increase in oil prices"; "massive changes")
massive -- (consisting of great mass; containing a great quantity of matter; "Earth is the most massive of the terrestrial planets")
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