Do robots skip important words?

While robots try to skip meaningless words, do they miss?

[lfloor]

What if free is an important word, but engines pass over it?

[toolman]

Hi lfloor.

I'm not exactly sure what you're asking. From this list [searchengineworld.com] I can see that free is indeed filtered out.

Are you concerned about free as in "free speech" being the keyword phrase?

[Brett_Tabke]

That's just my stopword list tm. That is just built from real world experiences. Free is not a stop word on most search engines, but it so common that I treat it as such.