In learning a new language one has to acquire new words somehow; be that from reading and figuring new words out from context (caveat emptor, that can go wrong quite badly ;}), a dictionary on your desk, or an online tool.
The risk of using google / a dictionary is that it doesn't convey nuances in meaning, and you're quite likely to use one valid translation out of context and it sounds terribly off, because languages rarely have 1-to-1 equivalents on a word per word basis.