gigantesque
Very large; like a giant; gigantic.
As Smythe took the handles and they turned the great corner of the street, Angus was amused to see a gigantesque poster of “Smythe’s Silent Service,” with a picture of a huge headless iron doll, carrying a saucepan with the legend, “A Cook Who is Never Cross.”
Where it comes from
From French, from Italian gigantesco, ultimately from Ancient Greek γίγᾱς (gígās, “giant”). Compare giga-, giant.
Adapted from the Wiktionary entry gigantesque (CC BY-SA 4.0).