Yes, quietly is a Scrabble word!
...and is worth 19 points in Scrabble, and 20 points in Words with Friends
quietly
Adverb
1. With low volume
2. With little or no sound
3. With little or no activity or no agitation (`quiet' is a nonstandard variant for `quietly')
4. In a restful manner
What Scrabble words can I make with the letters in quietly?
6 Letter Words
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3 Letter Words
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Words that can be created with an extra letter added to quietly:
A:equality