monumental

US /ˌmɑ:njuˈmentl/

UK /ˌmɒnjuˈmentl/

B1
adj.Adjective(Mistake/waste of time) huge; very big; severe
Landing a man on the moon was a monumental achievement for humanity
adj.AdjectiveGreat in importance, extent, or size.
The construction of the Great Wall was a monumental undertaking.

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