polar opposite

Webster's Dictionary (GCIDE)

1.One who opposes; an opponent; an antagonist. [Obs.] [1913 Webster]

The opposites of this day's strife.— Shak.[1913 Webster]

2.That which is opposed or contrary in character or meaning; as, sweetness and its opposite; up is the opposite of down. [1913 Webster +PJC]

The virtuous man meets with more opposites and opponents than any other.— Landor.[1913 Webster]

polar opposite that which is conspicuously different in most important respects. [PJC]