monumentally
From Longman Dictionary of Contemporary Englishmonumentallymon‧u‧ment‧al‧ly /ˌmɒnjəˈmentəli $ ˌmɑː-/ adverb VERYextremely – usually used of negative qualities It was a monumentally stupid thing to do.Examples from the Corpusmonumentally• That so much effort has gone into it renders it monumentally absurd.• Feelings were beginning to creep in, and that would be monumentally stupid, to actually begin to care for him.• He would have to be monumentally stupid to do that.• So he had heard those monumentally stupid words.