dev·il's advocate
n.
One who argues against a cause or position, not as a committed opponent but simply for the sake of argument or to determine the validity of the cause or position.
Synonyms for devil's advocate
On this page, you will find 30 slang terms related to devil's advocate. Some of the top words include: whatever, metafiltering, not same, backin', Bellignorant, and 25 more.