slier
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sli·er
(slī′ər)adj.
A comparative of sly.
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.
slier
(ˈslaɪə)adj
a comparative of sly
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014
sly
(slaɪ)adj. sly•er sli•er, sly•est sli•est, adj.
1. cunning or wily.
2. stealthy; surreptitious.
3. mischievous or roguish: sly humor.
n. 4. on the sly, secretly; furtively.
Idiom. [1175–1225; Middle English sly, sley < Old Norse slŒgr sly, cunning]
sly′ly, adv.
sly′ness, n.
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.