The 8-letter "opposite gender" of a male giant is "giantess."
(There is no common 8-letter antonym to a giant or to the adjective giant.)
enormousgiganticspaciouscolossal
Midnight
exciting
deprived
stopping
Imprison is a word which has the opposite to liberate and has eight letters
One is shutting.
stopping :) EASY x
a. & n. from Start, v.
Indifference is the opposite word of concern.
many, much source: http://thesaurus.reference.com
The word "giant" is in the King James Version of the Bible 8 times. It is in 8 verses.