SLACKLY is a playable word

slackly Scrabble® Dictionary

adverb
in a slack manner
60 Playable Words can be made from "SLACKLY"
   2-Letter Words (6 found)
   3-Letter Words (19 found)
   5-Letter Words (12 found)
   6-Letter Words (1 found)
   7-Letter Words (1 found)