a) They simply haven't come across the word(s).
b) They have better things to do than to pay attention to useless synonyms.
c) Like me, they just pretend not to know words, so they can snicker to themselves at the speaker's frustration.
d) They are unintelligent.
e) It was probably a combination of a and b, but I felt like throwing in more because I'm putting off a pithy slice of homework pie.
|