-ly words. a.k.a adverbs
Speedily I drove through the forest.
I fell madly in love with her.
You're deeply troubled.
Happily. Scantily. Sillily. Terrifyingly. Un-happily.
Good writing uses few adverbs, and only necessary adjectives.
Now, most people know that when I'm marking on someone's manuscript I will circle ALL the ly words--even if it's family. This is because I have trained my eye to spot them right away and my fingers to wriggle the pen in a loop around those little letters at the end of words. I do it because Carol taught me to do it, and because I learned the importance of watching what words I use in my writing (and particularly what words others use in their writing)... :)
If you want to say something that uses an adverb, stop and think about different ways you could say it. The point isn't to avoid them completely--sometimes they're useful. But, if used too often they can really muddy a manuscript quickly and irritatingly so. Succinct = good. Use less words and see how it affects your writing. I'm a big fan of the saying "Less is More."