Goliath
big
biggish
colossal
gangling
gargantuan
giant
gigantic
ginormous
huge
humongous
immense
jumbo
king-sized
large
leggy
lofty
long-shanked
longish
mammoth
massive
mountain-high
of great stature
rangy
redwood-high
sizable
sky-high
skyscraperesque
statuesque
stripper-pole-ific
towering
whopping