monumental

adj.

[1]	staggering , awe-inspiring , outstanding , prominent , stupendous , vast , awesome , epoch-making , historic , history-making , memorable , lasting , permanent , unforgettable , significant , notable , noteworthy , impressive , marvellous , prodigious , wonderful , wondrous , spectacular , magnificent , grand , striking , glorious , enduring , classic
[2]	massive , huge , gigantic , enormous , prodigious , colossal , immense , vast , tremendous
[3]	commemorative , massive , monolithic , memorial
[4]	egregious , catastrophic , calamitous , huge , enormous , awful , abject , terrible , unforgivable , unbelievable , monstrous , (Colloq) whopping