Ignore the techie guys here who'll argue the toss about security, as anything other than a dictionary-based word will require the would-be hacker to park a Cray outside your house for years before they crack it....and for what? a home broadband connection?
Go wash your mouth out with soap young man.
A dictionary attack doesn't take long with a processor boost provided by average modern GPU found in even the most modest of laptops.
Put a little bit of effort into your passwords.... the addition of a symbol and number (or two) won't harm most people's ability to remember a password !
Plus its good habit training. If they can't manage to come up with a reasonable Wifi password, god forbid what they're using for online banking !