Tolerate/prohibit
Tolerate, to fail to prevent an action or behaviour from neglect or indifference, is passive, while to prohibit – to forbid by authority – necessitates action. Example: The boss tolerated Ed’s lecherous antics because he was too busy with the expansion to notice. The new work policy prohibits inter-office dating and sexual harassment.
Evasive/articulate
To articulate is the ability to speak with clarity, but evasive implies something untoward or dishonest, not merely unclear. Example: Once the background check was complete, we understood why Jane was so evasive about her work history. Dennis was the best person to articulate our position because he was well-versed in the details.
Luxury/cheap
A luxury is something expensive or desirable but not essential whereas cheap simply means low-price or of poor quality. The opposite of luxury is a necessity; expensive is the opposite of cheap. Example: The going-out-of-business sale priced the dresses so cheap, I bought three, which made them a luxury purchase.
Think this pair is confusing? Some words are their own opposites!