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Monumentous (adjective)
monumental; very large or important
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Monumental (adjective)
In the manner of a monument.
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Monumental (adjective)
Large, grand and imposing.
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Monumental (adjective)
Taking a great amount of time and effort to complete.
“”a monumental task””
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Monumental (adjective)
Relating to monuments.
“Monumental construction.”
Wiktionary
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Monumental (adjective)
great in importance, extent, or size
“it’s been a monumental effort”
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Monumental (adjective)
of or serving as a monument
“additional details are found in monumental inscriptions”
Oxford Dictionary