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1. That confounds or contradicts or confuses
   "Cigarette smoking in this example is a possible confounding variable"
   - contradictory

1. Be confusing or perplexing to; cause to be unable to think clearly
   "These questions confound even the experts"
   - confuse, throw, fox, befuddle, fuddle, bedevil, discombobulate
    
2. Mistake one thing for another
   - confuse

See also: unsupportive

Type of: be, misidentify, mistake

Encyclopedia: Confound