Only this week did I realize that there are two words for adverse. One for ‘I’m having an adverse reaction,’ and another for ‘I’m not averse to a little hard work.’ Hard work! It’s hard work keep up with all these doofy definitions.
How about these old chestnuts?
complimentary / complementary
stationary / stationery
principal / principle
Luckily, the differences between these definitions were drilled into my head in junior high.
Here are a few others that annoy me:
And don’t even get me started on words that can mean the opposite of themselves! Dubious, fearful, etc.