Translation of "monumental" into Estonian

I mean, do you think we're making some massive, monumental mistake?

Kas sa ei arva, et me teeme mingi suure monumentaalse vea?

I want to help Micah achieve something monumental in his life.

Ma tahan aidata Micah'il midagi suurejoonelist oma elus korda saata.

Those lives will never be forgotten, and their memory will be preserved in an eternal flame here at the monument.

Neid elusid ei unustata kunagi ja mälestused neist säilitatakse selle monumendi igaveses tules.