me fail english?

As another indication that my intellect is taking a beating at work, I spent five minutes this morning trying to remember how to suggest that one should be careful. First, I wrote "I'd be wary", but that didn't look right - and "vary" definitely looked wrong. "Weary" is clearly a word, but didn't seem to fit semantically. It took some googling to determine that my original version was correct.

Who needs memory/grammar/basic language skills if you have Google, right?