Here's an interesting list of words and phrases that have opposing means. A couple of examples:

Apparent: Not clear or certain (For now, he is the apparent winner of the contest.) vs. Obvious (The solution to the problem was apparent to all.)
Cite, Citation: For doing good (such as military gallantry) vs. for doing bad (such as from a traffic policeman)
Fix: to restore to function (fixing the refrigerator) vs. to make non-functional (fixing the dog)

These are worth brushing through; they're good reminders of how to avoid double meanings. And "apparent" is one that ambiguously makes its way into papers too often.