Synonyms for King-size:

adj.

all (adjective)
king-sized.
prodigious (adjective)
giant, big, large.

n.

great, broad, large-size, giant, huge, wide, high. king-size (noun)
king-sized, big, large.

Other synonyms:

wide. high. great. Other relevant words:
great, huge, giant, wide, high, broad.