I once used the word OBSOLETE in a headline, only to discover that 43 per cent of housewives had no idea what it meant. In another headline, I used the word INEFFABLE, only to discover that I didn't know what it meant myself.
David OgilvyThe more informative your advertising, the more persuasive it will be. Before people making a buying decision, they have many questions. For example, why they should buy from you, why your product is better than other similar products, why they should trust you, and why they should buy it now, etc.
David Ogilvy