1) Of a huge or gigantic size 2) Of or suited to a giant 
• (a.) Befitting a giant; bombastic; magniloquent.
Gi`gan·tesque' adjective [ French] Befitting a giant; bombastic; magniloquent. « The sort of mock-heroic gigantesque With which we bantered little Lilia first.» Tennyson. 
gigantesque 1. Of enormous size or magnitude; huge; of or suited to a giant. 2. Befitting a giant; bombastic; magniloquent.
of a huge or gigantic size; of or suited to a giant.