monumental
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/ˌmɑːnjuˈmentl/
🇬🇧
/ˌmɒnjuˈmentl/
very important and influential, often after much work
The team's monumental effort led to a major breakthrough in science.
extremely large, good, bad, or impressive
Cleaning the entire park is a monumental task that requires many volunteers.
related to or serving as a monument
The monumental statue in the square honors the city's founders.