in which i'm a jerk and point out 3 words lots of people use incorrectly. just because it makes my brain leak

bemused:
what it really means: confused.
what it doesn't mean: amused.

nonplussed:
what it really means: totally perplexed.
what it doesn't mean: un-perplexed or unimpressed.

ambivalent:
what it really means: torn between doing/feeling two opposites.
what it doesn't mean: indifferent.

annnnnnd scene.