Yes, poorly is a Scrabble word!
...and is worth 11 points in Scrabble, and 12 points in Words with Friends
poorly
Adverb
1. (`ill' is often used as a combining form) in a poor or improper or unsatisfactory manner; not well
Adjective
1. Somewhat ill or prone to illness
What Scrabble words can I make with the letters in poorly?
5 Letter Words
4 Letter Words
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3 Letter Words
2 Letter Words