Synonyms for Cast aside:

adj.

abandoned (adjective)
cast away.

n.

eradicate, remove, replace, do away with, dump, dispose of, eliminate. cast aside (noun)
discard, fling, throw away, dispose, chuck out, cast out, toss away, toss, put away, throw out, toss out, cast away.

v.

discard (verb)
dispose of, abandon, eliminate, do away with, remove, throw out, jettison, dump, throw away.
eighty-six (verb)
toss out.
omit (verb)
discard.
possession (verb)
discard, fling, throw away, dispose, chuck out, cast out, toss away, toss, put away, throw out, toss out, cast away.
reject (verb)
cast out.

Other synonyms:

eighty-six
toss out.
get rid of
discard.
reject
cast out.
Other relevant words:
abandon, eliminate, dispose of, remove, jettison, dump.