1. massive, monolithic, monumental, large (vs. small), big (vs. little)

usage: imposing in size or bulk or solidity; "massive oak doors"; "Moore's massive sculptures"; "the monolithic proportions of Stalinist architecture"; "a monumental scale"

2. monolithic, undiversified (vs. diversified)

usage: characterized by massiveness and rigidity and total uniformity; "a monolithic society"; "a monolithic worldwide movement"

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See also: monolithic (Dictionary)