My late grandfather had several word-choice peeves for which he would gently interrupt a speaker, especially a grandchild, in order to correct. The one I remember most was his dislike for the use of "hard" as a synonym for "difficult," as in the statement:
This homework is really hard.
I read and hear "hard" used this way all the time and often wonder if there is something incorrect about it. Is there, or has there ever been, any basis for this quibble?