I have just been invited to pay £125 for a spa treatment which includes a "distressing scalp massage". Being a sensitive soul, I find the mispelling distressing enough on its own without paying £125 to be upset further.
Another two words which look similar but have opposite, or near-opposite meanings, are energise and enervate (which originally had something to do with cutting a horse's tendons, but now means to weaken, to destroy someone or something's capacity for vigorous effort). I was very distressed when I found Oliver James (or his editors) had used "enervate" throughout Affluenza to mean "energise" - I found it impossible to take any of his advice seriously after that.
A distressing scalp treatment