Synonyms for Over-the-top:

adj.

all (adjective)
extraordinary.
ridiculously excessive (adjective)
extraordinary.

n.

silly, not in your right mind/not right in the head, laughable, ridiculous, insane, ludicrous, mad, crazy, childish. over-the-top (noun)
immoderate, extraordinary.

Other synonyms:

insane, ludicrous, ridiculous, mad, crazy, laughable. silly. childish. Other relevant words:
silly, ridiculous, insane, childish, laughable, ludicrous, mad, crazy.