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Related to sluggardly: sunfish
A slothful person; an idler.
[Middle English sluggart, probably from sluggi, lazy, probably of Scandinavian origin.]
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
slug•gard•ly(ˈslʌg ərd li)
like or befitting a sluggard; slothful; lazy.
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.