"You keep using that word. I do not think it means what you think it means." This book discusses how and why people often confuse or misuse certain words, provides published examples to show how common these errors are, and explains how to fix them. In case you were wondering, "inconceivable" is not one of the words mentioned.
An entertaining and informative guide to the most common 150 words even smart people use incorrectly, along with pithy forays into their fascinating etymologies and tangled histories of use and misuse.